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如图,在△ABC中,∠C=90°,AC=8,AB=10,点P在AC上,AP=2,若⊙O的圆心在线段BP上,且⊙O与AB、AC都相切,则⊙O的半径是 .
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如图Rt△ABC中∠C.=90°AC=8BC=4PQ=AB点P.与点Q.分别在AC和AC的垂线AD上
如图在△ABC中∠BAC=90°AB=AC点D.为边AC的中点DE⊥BC于点E.连接BD则tan∠D
已知如图△ABC中∠C=90°AB=10AC=8BD为∠ABC的角平分线交AC于D.过点D.做DE垂
如图在△ABC中∠C.=90°在AB边上取一点D.过D.作DE⊥AB交AC于E.1求证△AED∽△A
如图在△ABC中∠C.=90°∠ABC的平分线BD交AC于点D.若BD=10cmBC=8cm则点D.
如图Rt△ABC中∠C=90°AC=8BC=4PQ=AB点P与点Q分别在AC和AC的垂线AD上移动则
如图在△ABC中∠C=90°BD平分∠ABC交AC于点D过点D作DE⊥AB于点E点E恰好为AB的中点
如图在△ABC中∠C.=90°AB=10AC=8以AC为直径作圆与斜边交于点P.则BP的长为____
如图在Rt△ABC中∠A=90°BD平分∠ABC交AC于点D且AB=4BD=5那么点D到BC的距离是
如图在Rt△ABC中∠C.=90°AB=10AC=8.线段AD由线段AB绕点A.按逆时针方向旋转90
如图1221△ABC中∠C.=90°AB=10AC=6以AC为直径的圆与斜边交于点P.求BP长.
已知在△ABC中∠ABC=90°AB=3BC=4.点Q.是线段AC上的一个动点过点Q.作AC的垂线交
如图△ABC中∠A.=90°AC=20AB=10延长AB到D.使CD+DB=AC+AB求BD的长.
如图在△ABC中∠C.=90°点D.是AB边上一点DM⊥AB且DM=AC过点M.作ME∥BC交AB于
如图在△ABC中∠C.=90°AC=14BD平分∠ABC交AC于D.ADDC=52则点D.到AB的距
在△ABC中∠ACB=90°经过点C.的⊙O.与斜边AB相切于点P..1如图①当点O.在AC上时试说
如图在△ABC中∠C.=90°∠ABC的平分线交AC于点E.过点E.作BE的垂线交AB于点F.⊙O.
探究如图①在△ABC中DE是边BC的垂直平分线交BC于点D.交AB于点E.连结CE求证CE+AE=A
如图在△ABC中∠ACB=90°AC=8AB=10ED垂直平分AC交AB于点E.则ED的长为.
如图在Rt△ABC中∠C.=90°AC=6BC=8把△ABC绕AB边上的点D.顺时针旋转90°后得到
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TheQingmingFestivaliscelebratedwithathree﹣daynationalholidaywhosenameoriginatesfromthesayingPlantsstarttoreviveandprosperatQingminginacleanandbrightway.ThusthefestivaliscalledQingmingwhichmeanscleanandbright.1Tombsweepingaimstocommemoratefamilyancestorswhilegoingonaspringoutingallowseveryonethechancetoenjoythebeautifulsceneryandenjoytheseason. Traditionalcustoms Tombsweeping.2Onthisdaythewholefamilygathersinfrontoftheirancestraltombs.Theyofferfruitandwinetotheirancestorsandcleantheweedsfromaroundthetomb.Finallytheykowtowandprayhopingfortheirancestors'blessingfortherestoftheyear. Springouting.ThetimearoundtheQingmingFestivalisoneofthemostsuitableseasonsforaspringoutingasplantsarethrivingandflowersareblooming.Peoplecanhaveagreattimeoutdoorswiththeirfriendsandfamily.3 Traditionalfood QingtuanagreenriceballtinyenoughtofitintoyourhandisalsocalledQingmingguoorAiguo.4ItisamixtureofstickyricepowderandgreenvegetablejuicestuffedwithsweetenedbeanpasteQingtuantastessweetwiththefreshfragranceofAicaoagreenspringvegetable. IncelebrationofQingmingpeoplefromShaanximakesteamedbunsknownasHuamomadeintodifferentshapes.5Someareforpeacefulfamilylifewhileothersrepresentthewishforhealth. A.Witheachdistinctlookcomesagoodblessing B.Playingfootballandflyingkitesarepopularactivities. C.ItispopularinthesouthernregionsoftheYangtzeRiver. D.Familymembersgathertogethertocelebrateandtastethefood. E.ThetraditionoftombsweepingoriginatesfromtheQinDynasty F.Manytraditionalcustomsarepracticedtoshowrespectforourancestors. G.Thetwomainactivitiesoverthefestivalincludetombsweepingandgoingonaspringouting.
Societytellsusthatyoucan'tteachanolddognewtricks.Butitdoesn'thavetobethatway.AnewstudypublishedinHumanDevelopmentpointsoutthatusingachildlikeapproachtolearningcanhelppeopleofanyagetakeonandrisetonewchallenges.1 Venture冒险outsideyourcomfortzone.Asadultswetendtousesimilarskillsdayinanddayout:Wetakejobsinfieldswerealreadygoodatdrivethesameroutestothesameplacesandfallintoroutineswe'recomfortablewith.2.Switchingtosomethingmorechallengingmayhavemorecognitivebenefits. 3.Afearofmakingmistakesisanotherreasonadultsaresoslowtolearnnewthings;ifwetryandfailwecanfacecriticismlosemoneyorgetfired.That'swhyit'simportanttobuildupasupportnetworkofpeople﹣atworkandathome﹣whoallowyoutomakemistakesandlearnfromthem. Makeaseriouscommitmentanddon'tgiveup.4.Ifyoucanafforditspendingmoneyonanewpursuit﹣forexamplebookingatriptoRometopracticeyourItalian﹣mightalsomakeithardertothrowinthetowel. Learnmorethanonethingatonce.Wetendtozeroinononehobbyoroneskill.Butdividingthattimeandenergyintothreeorfourareaswillstretchyourbraininalldifferentdirections.5Forexamplemaybeyoustartedlearninganewlanguagein2018andthisyearyouaddsinginglessonsandnextyearyoutrysomethingelse.Youcanaddthingsgraduallybasedonwhatyoucanhandle. A.Turntoyourfriendsandfamily. B.Thefollowingstrategieswilldothetrick. C.Surroundyourselfwithencouragingpeople. D.Tellingfriendsaboutyournewgoalcanhelpkeepyoumotivated. E.Butallthisfamiliaritylimitsthepartsofthebrainwe'reusingregularly. F.Thatdoesn'tmeanyoushouldstartallthenewchallengesallatoncethough. G.Sofeelingcomfortablecanreducestressandmakeyouhappierandmoreproductive.
TOKYOJune8Xinhua﹣﹣TheBeijingOrganizingCommitteeofthe2022OlympicandParalympicsWinterGamesheldapromotioneventintheJapanesecapitalTokyoonSaturdaytointroducethelatestdevelopmentsinpreparationfortheBeijingWinterOlympics. ThepromotioneventwhichusedanexhibitionwallandtheCharmingBeijingphotoexhibitiontoshowcasethepreparationsofBeijing2022waspartofBeijingWeekaseriesofactivitiestocommemoratethe40thanniversaryoftheestablishmentofsister﹣cityrelationsbetweenBeijingandTokyo. Ontheexhibitionwallwithanareaof33squaremetersBeijing2022organizersshowcasedfiveaspectsincludingtheBeijingWinterOlympicsvisionBeijing'swintersportstraditionemblem2íofBeijing2022competitionplanningandtheNationalSpeedSkatingOval. AtthesametimeoldphotosoftheChineseandJapaneseicehockeyteamsechoedthe40thanniversaryoftheestablishmentofsister﹣cityrelationsbetweenthetwocitiesandthethemeoftheBeijingWinterOlympics. ThepromotionvideosoftheBeijing2022emblemsaswellasotherrelatedvideoclipsdrewgreatinterestoftheaudience. TheCharmingBeijingphotoexhibitiondisplayedsomeoftheWinterOlympicvenuesshowingtheprogressofthepreparationsfortheBeijingWinterOlympics. MeanwhilesandtableVRglassesandtheBeijingWinterOlympicsBrochurearealsoprovidedtolettheaudiencevisuallyexperiencetheuniquecharmoftheNationalSpeedSkatingOvalandthefeaturesofothercompetitionvenues. ChangYuDirectorGeneraloftheMediaandCommunicationsDepartmentoftheBeijingWinterOlympicOrganizingCommitteeintroducedtheprogressofthepreparations2022andthevisionofcooperationbetweenBeijing2022andTokyo2020. ChangYusaidthattheBeijingWinterOlympicsOrganizingCommitteestayscommittedtowiththeaimofdeliveringahostingtheGamesinagreeninclusiveopenandcleanmannerwithanaimofdeliveringafantasticextraordinaryandexcellentOlympiceventtotheworld. TheBeijingWinterOlympicswillopenonFebruary42022.whichwillfeaturesports15disciplinesand109events. 1Howwasthepromotioneventcarriedout AByadvertisingonTVinBeijingandTokyo. B.BysendingoffbrochurestocitizensinTokyo. C.Byprovidingvariousvisualexperiences D.ThroughtoursallaroundTokyo. 2Theunderlinedwordcommemorateinparagraph2isclosestinmeaningto A.celebrate B.appreciate C.compare D.combine 3WhatcanbeinferredfromChangYu'sintroduction A.BeijingwillhosttheOlympicsearlierthanTokyo. B.Beijingiswellpreparedforthe2022event C.Beijing2022provesagreatsuccess. D.Beijing2022willbeenvironmental﹣friendly. 4Whichofthefollowingcanbethetitleofthispassage A.TheSister﹣CityAnniversarybetweenBeijingandTokyo B.Beijing2022PromotionEventinTokyo C.BeijingandTokyoFriendshipForever D.PreparationsforBeijing2022Olympic
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下画一横线并在该词下面写出修改后的词. 注意: 1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第1处起不计分. ItwasasunnydaybutIwenttoXishanParkforaspringouting.ThemomentwhenIenteredtheparkavarietyofbeautifulflowersandgreentreescameintosight.AttractingbythebeautyIcouldn'thelptakingphotosAsIwanderedalongthepathenjoyingthebeautifulviewInoticedanythingunpleasant.Twoschoolgirlsjumpedoverthefencetopickflowers.Obviouslytheydidn'trealizethattheirbehaviorhasdonegreatdamagetobeautyofthepark.WithouthesitationIwentupandstoppedherpolitely.Feelingquiteembarrassedthetwogirlscameoutimmediate.Thentheytookpicturesinsidethefence.SeeingthatIsmiledandeverythinglookednicerinmyeye
Beijingroastduckwhichishonoredasbyfar1deliciousdishintheworldhaswonfamebothathomeandabroad.Nowadaysanincreasingnumberof2foreignertravelingtoBeijingfallinlovewith3. Preparingqualityroastduck4bealongcomplicatedprocessofmanystepsfromselectingtheduckatthebeginningto5serveittothedinersattheend.Eachstepiscarefullytakentoguaranteetheroastduckisattractivein6appearredincolorfragrantandhotwiththinsteamwhenserved.Intherestaurantducksareroastedupontheorderofthediners.Afteraroastduckisreadyitisbroughttothedinersinfrontof7achefwillskillfullyslicethejuicymeateachpiecewithwell﹣cookedskin8attach.Youcandiptheslicesofduckintosweetsauce酱andwrapthemeatwithsomespringonionsinsideathinpancakeandonlythendoesonefinallytakeabite!Normallytheremainingbonesoftheduck9cookslowlyinacloseddishformakingdeliciouscream﹣whitesoup.Allgoeswellwithwinethusmakingthedinner10unforgettablefull﹣duckbanquet宴会.
Whenhospitalstaffareinfullscrubs手术衣theirfacesarealmostcompletelycoveredbytheircapsandfacemasksandwecanonlyseetheireyesandeyebrows.InordertosolvetheproblemadoctorinSydneyAustraliacalledRobHackettlaunchedacampaignnamedTheatre手术室CapChallenge﹣encouragehospitalstaffstowritetheir'namesandrolesontheircaps.Atfirsthiscolleaguesdidn'ttakeitseriously.HoweverwithtimegoingonithasbeenadoptedaroundtheworldwithstudiesfromtheUSandUKreportinghowthissimpleideacandecreasehumanerrorsinhealthcare. Iwenttoatheatrewheretherewereabout20doctorsandnursesintheroomDr.RobHackettsaid.IstruggledtoevenasktobepassedsomeglovesbecausethepersonIwaspointingtothoughtIwaspointingtothepersonbehindthembecauseIdon'tknowtheirnames.saidRob.Asweallknowdoctorsareastressfulprofession.Whenfacedwithlifeanddeaththeyneedtosavethepatient'slifeforasecond.Atthemomenteffectivecommunicationsareimportant. TheTheatreCapChallenge'isinresponsetoconcernsabouthoweasilyavoidablemistakesandpoorcommunicationarecontributingtorisingharmfuleventsforourpatients.saidRob.Weneedtodevelopsystemswhichreducemistakesandmisunderstandingwithoutcausingharm.Forthistohappenweneedtoleteveryoneknowwe'rehuman.headded. Ontheotherhandfromthepatients'viewpointcapswithnamesonthemcanmakepatientsmoreunworried.Wheneveryoneappearsthenameitisextremelydifficulttodistinguishwhoiswho.Knowingthemrelaxed. 1Whatcanwelearnfromparagraph1 A.Hospitalstaffareaskedtocovertheirfacesinhospitals. B.Robisinfavorofwritingnamesandrolesoncaps C.Robwantedtobeaprofessionaldoctor. D.Rob'sideacanincreasehumanerrorsinhealthcare. 2WhatcanweknowabouttheTheatreCapChallengefromthetext A.Itcanmakethecapsmorefashionable. B.Itisstronglyopposedtobyallthedoctorsandnurses C.Itaimstoavoidmistakesandpoorcommunication. D.Itcanhelppeoplepasssomeglovesinatheatre. 3Whichofthefollowingbestexplainswerehumanunderlinedinparagraph3 A.We'regenerous. B.We'renegative. C.We'resatisfied. D.We'rekind. 4What'sthepatients'attitudetowardsthecampaign A.Supportive. B.Disapproving. C.Doubtful. D.Uncaring.
SupercomputerswhichcananalysebloodsamplesandpredictwhichpatientsarelikelytobecomeseriouslyillcouldsavetensofthousandsoflivesayearitwasrevealedlastnightaccordingtoTheDailyExpress. TheartificialintelligenceAIsystemdevelopedatUniversityCollegeLondonandsettobepilotedinNHShospitalslaterthisyearwillscreenatriskpatientssodoctorscantakeearlyactiontopreventdeathorseriousillness.ProfYoungaconsultantsurgeonatSouthendUniversityHospitalsaid:Iamsoexcitedaboutthisformoftechnology.Insteadofpeoplegettingsickordyingbecausetheyarenotpickedupintimethiswillallowustostepinearlierwhichwillsavelivesandanenormousamountofmoney.IthinkthepotentialofAIinhealthcarelikethisisasbigastheIndustrialRevolutionwas﹣andsignalsacompletelynewexampleinthewaywemanagehealthcare. ThetechnologyisthebrainchildofDrVishalNangaliaaconsultantattheRoyalFreeHospitalinLondon.HeusedAItoanalyseabillionstoredbloodsamplesfrom20differentUKhospitaltrustsdatingbackupto12years.Computersassessbloodtestresultsbypickingupsubtlechangesinredandwhitebloodcellssuggestingapatientisgoingdownhill. Hefoundthetechniqueforecastoutcomesofpatientswithkidneyproblemswithupto95percentaccuracy.Traditionalmethodshighlightingseriouspatientconcernspickedupasfewas16percentofpatientswhowentontodie.Thisgivesustheopportunitynotonlytosavelivesbuttopreventseriousillnessmakingthehealthservicenotonlysaferbutmoreefficient.ProfYoungsaidInsteadofwaitingforpeopletogetworsewewillbeabletotreatthemearlier. 1WhatdoestheunderlinedphrasescreeninParagraph2mean A.comfort. B.treat. C.spot. D.nurse. 2Howdosupercomputershelpsavelives A.Bystoringbloodsamples. B.Byanalyzingpatients'cases. C.Byobservingchangesinbloodcells. D.Byassistingdoctorswiththeiroperations. 3WhydidProfessorYoungmentiontheIndustrialRevolution A.ToshowtheinfluenceofAI. B.Tostresstheimportanceofhealthcare. C.Tointroducethetopicofsupercomputers. D.Topresenttheachievementhehasaccomplished. 4Whatdoweknowaboutthenewtechnology A.Ithelpspatientsrecoverearlier. B.Ithashelpedsavethousandsoflives. C.Itwillpromotethehealthservicegreatly. D.Itisintendedforpatientswithkidneydiseases.
DerekRabeloisnottheonlysurfertoconquerHawaii'sfamousPipelinebigwavebreakbutwhileallothersusetheirsighttodoitthisyoungprofessionalsurfermustrelyonlyonhisothersenses.That'sbecauseheiscompletelyblind. WhenDerekwasbornover24yearsagohegothisnamefromDerekHothefirstHawaiiansurfingworldchampion.AsurfingenthusiasthimselfErnestodreamedthathissonwouldsharethetalentofhisuncle.aprofessionalsurfer.UnfortunatelyDerekwasborncompletelyblindbutthisdidn'tstophisfamilyfrombelievingthathecoulddoanythinghewantedevenifthatmeantbecomingasurfer. Atage2DerekreceivedabodyboardandthebeachesofGuarapariBrazilbecamehisbackyard.Hewasalwayscomfortableinthewaterandsurfingwasinhisbloodbuthedidn'tactuallytryridingawaveuntilheturned17whenhisfatherboughthimasurfboard.HisfathertaughthimthebasicsandencouragehimtokeeppracticingbutaftersuccessfullystandinguponthesurfboardDerekknewheneededtobecomemuchbetterifhewasgoingtoachieveErnesto'sdreamandbecomeaprofessionalsurfer.SohejoinedthePraisdoMorrosurfschoolwherehestudiedundercoachFabioMaru. StandinguponasurfboardandconqueringsmallwavesisonethingwhilegatheringthecouragetotakeonHawaii'sboard﹣breakingPipelineisanother.Butthat'sexactlywhatDerekRabelosetouttodojustmonthsafterlearninghowtosurf.Everyonetoldhimitwastoodangerousbuthefelthecoulddoit.AndhedidearningthepraiseoffamousprofessionalsurferslikeKellySlaterandMickfanning.Now24RabelohasbeensurfingthePipelineeverywintersince. 1Whatdoesthefirstparagraphtellus A.Goodeyesightisnecessaryforbecominggoodsurfer. B.NobodyhaseverconqueredHawaii'sbigwavebreak. C.DerekRabelodreamstoconquerHawaii'sbigwavebreak. D.DerekRabeloistheonlyblindprofessionalsurfertoconquerHawaii'sbigwavebreak. 2HowdidErnestobehaveafterDerekwasborn A.Heneverlostconfidenceinhim. B.Henamedhimafterhisuncle. C.Hesenthimtosurfingchampion. D.Hestartedhisowninterestinsurfing. 3AfterDerekwasabletostanduponthesurfboardhe. A.begantotryridingawave B.wasnolongerafraidofwater C.realizedhestillhadalongwaytogo D.knewhisfathersdreamhadcometrue 4WhichofthefollowingwordscanbestdescribeDerekaccordingtothelastparagraph A.Skillfulbutproud. B.Braveandconfident. C.Courageousbutstubborn D.Thoughtfulandmodest.
XuLizhena74﹣year﹣oldladyhasbeenactingasatourguidefornearly20yearsinYangShuoGuiLin1isacityknownbothinChinaandabroadforitsbeautifullandscape2sheattendedonlyprimaryschoolwhenshewasyoungShecannowspeakapproximately11foreignlanguages3fluent. Since20yearsagotourists4showaffectionforYangShuoincludingagreatmanyforeignersInordertomakea5liveXuLizhenbegantosellwater.Howevershecouldhardlymakeanymoneyatfirstbecauseforeignersdidn'tunderstandheraccent.Shetriedtoimitatethe6pronounceoftheforeignerstakenotesandlearnthem7heart.IfshecameacrosstouristswhocanspeakbothChineseandaforeignlanguageshewouldaskthemtotranslatetheirwordsmanytimessothatshecouldrememberthem8well.Itisinthiswaythattheoldgrannymasters11languagessuchasEnglishFrenchRussianKorean.Nowshehasnodifficultyatall9communicatewithforeignfriendsinsimpleoralEnglish.Sheisalso10refertoasMotherMoonforherkindnessamongtourists.
Withoutreducingfunanyonecanhostabirthdaypartyonatightbudget.SanFranciscotheEastBayandSouthBayinparticulararefullofonlyfound﹣herelocationsthatcanmakethedayspecial.AdayatGreatAmericatourofSBCParkandabaseballgameoraprivatepartyattheOaklandChabotSpaceandScienceCenterareexperiencesuniquetoBayAreafamilies. Thesepartiesarethemostfunbecauseabudgetforcesyoutobecreativewithwhatyou'vegot.Thekeyhereistofindaspotthatisfreeorcheap. Afewplacestoconsiderarepublicparks﹣findoneswithage﹣appropriateplaystructuresthatarerelativelysafe.Inthesummerlocatealocalpoolwithplentyoflifeguardsandhavethosehandyparentscomealongasguests.Andasyouplanconsideryourguests'abilitiesandcomfortlevels.Ifyourchildlovestoice﹣skatebutherfriendshateitmaybeshecanchooseadifferentactivityormainlychoosetodothisasafamilybirthdayouting. Zoosarerelativelyinexpensiveaswell.TheSanFranciscoZoocharges﹩11peradultand﹩5foreachchildages3﹣11and﹩8for12﹣17.TheOaklandZooadmitsadultsfor﹩9andkids﹩5.50forages2﹣14. Museumsandaquariums水族馆oftenhaveafreeadmissionday.YoucantakekidstotheSteinhartAquariumforfreethefirstWednesdayofeachmonth.ThesamegoesfortheExploratoriumalsoinSanFrancisco.ThedeYoungMuseumisalsofreeforallvisitorsthefirstTuesdayofeverymonth.Italsochargesallkidsnothingwhoare12andunderdaily.Organizeyourfreemuseumdaysduringschoolbreaksorholidaysandyou'llsavealot. 1WhatcanyoudoattheOklandChabotSpaceandScienceCenter A.Holdaparty B.AdmireGreatAmerica C.Watchanationalbaseballgame D.LearnaboutthehistoryofSanFrancisco 1Whichofthefollowingisalwaysfreeforakidunder12 A.TheOaklandZoo B.TheExploratorium C.TheSanFranciscoZoo. D.ThedeYoungMuseum 3Whattypeofwritingisthistext A.Abudgetreport B.Atravelguide. C.Abookreview D.Amuseumbrochure
下列各选项对实验现象描述不正确的是
AtthefarendofIslingtonRoadinNewtonMassachusettslivesalittlegirlnearanddeartotheneighborhood.Two﹣year﹣oldSamanthaSavitzis1butshelovestotalktoanyonewhoknowssignlanguage.Andherwholepersonalitychangeswhenit'ssomeonewhocan2withher. Herdesireforcommunicationhasbeen3obvioustoeveryoneintheneighborhood.WheneverSamtriestobeneighborlythey4themselveslostforwords.Sotheyneedto5morethanabasicconversationwiththechildinthecommunity. Unfortunatelythisisn'tsomethingyoucan6withease.You'dneedthewholecommunitytolearnsignlanguage7foralittle2﹣year﹣oldgirl.Youcan't8neighborstodothat.Youcanonlyappreciatethemwhentheydo. OntheirownSam'sneighborsgottogether9aninstructorandarenowfully10anAmericanSignLanguageclass.Eventheparentsofdeafchildrendon't11tolearnsignlanguage.NowSamhasawhole12tocommunicatewithher. Andthislevelofinclusionwillalmostcertainlyguaranteeahappiermore13Sam.Herparentssaystherearen'twordsinanylanguagetoexpresstheir14.Infactthey'realreadyseeinga15intheirdaughter.Thefirstthingshesaystousis‘friend'saidhermotherIthinkyourheartwould16justasminedid. SometimesitfeelslikeAmericaislosingits17ofcommunity﹣butthenyouhearaboutaplacelikethiswhereittakesawholevillageto18achild.Nowthevillageisaliveandishereto19usthatwhatmakesagoodneighborhoodisnothingmorethangood20. 1A.blind B.deaf C.lame D.dull 2A.communicate B.sing C.play D.quarrel 3A.cheerfully B.peacefully C.painfully D.doubtfully 4A.make B.find C.let D.have 5A.strikeup B.putoff C.gothrough D.takein 6A.confirm B.trust C.discover D.solve 7A.still B.even C.just D.also 8A.educate B.expect C.wish D.help 9A.trained B.taught C.hired D.dismissed 10A.trappedin B.involvedin C.awareof D.equippedwith 11A.agree B.plan C.promise D.bother 12A.school B.community C.family D.club 13A.well﹣fed B.well﹣known C.well﹣behaved D.well﹣adjusted 14A.sympathy B.dilemma C.gratitude D.love 15A.complaint B.fault C.difference D.commitment 16A.melt B.race C.break D.burst 17A.control B.credit C.sign D.sense 18A.raise B.feed C.tell D.request 19A.urge B.warn C.guide D.remind 20A.neighbors B.friends C.partners D.colleagues
72hoursinBeijing TravelingtoChinaisnolongeraluxuryformanyforeignpassportholders.TheChinesegovernmenthaspermitteda72﹣hourvisa﹣freepolicythatoffersaccesstovisitorsfrom53countriesincludingtheUSFranceandAustria.LetsstartwiththecapitalofChinaBeijingHere'sapickofthebestinBeijing! MutianyuGreatWall YourtriptoBeijingisn'treallycompletewithoutseeingoneoftheNewSevenWondersoftheWorldtheGreatWallofChinaTheMutianyusectionoftheGreatWallisbyfarthemostwell﹣preservedofall.TakingaonehourbusrideMutianyuwouldbeyourideallocationforahalf﹣dayofhikingawayfromthelargecrowdsinthecity.AlsotheauthoritieshaveallowedtouriststopaintgraffitionaspecificsectionoftheGreatWallsince2014.TheGreatWallwasdesignatedaUNESCOWorldHeritagesitein1987. 798ArtZone Thiswouldbeonthetopofmylist!Namedafterthe798factorythatwasbuiltinthe1950stheartzoneishometovariousgalleriesdesignstudiosartexhibitionspacesfashionableshopsandbars.Youcouldeasilyspendhalfyourdaywanderingaroundthecomplexfeelingthecontrastofthepresentandthepast. SummerPalace LocatedinnorthwesternBeijingtheSummerPalaceisbyfarthecity'smostwell﹣preservedroyalpark.WithitshugelakeandhilltopviewsthepalaceoffersyouapastoralescapeintothelandscapeoftraditionalChinesepaintings.TheSummerPalacewasaddedtotheUNESCOWorldHeritageListin1998. SichuanProvincialRestaurant WhileinBeijingapartfromtryingthecity'sbest﹣knownPekingducktheSichuanprovincialrestaurantisoneofplaceswhereyoucanenjoyregionaldeliciousfood.ItoffersoneofChina'seightgreatcuisinesSichuanwhichrangesfromMapotofutospicychicken. 1WhichofthefollowingistrueabouttheMutianyuGreatWall A.Itisthemostwell﹣preservedpartoftheGreatWall. B.Youcanpaintgraffitianywhere. C.Youneedahalf﹣daytogetthere. D.ItwasdesignatedaUNESCOWorldHeritagesitein2014. 2WhenwastheSummerPalaceaddedtotheUNESCOWorldHeritageList A.In1950. B.In1987. C.In1998. D.In2014. 3WhichplaceistheauthorsfirstchoicewhenvisitingBeijing A.MutianyuGreatWall. B.SummerPalace. C.798ArtZone. D.SichuanProvincialRestaurant.
1解方程+=2 2如图在菱形ABCD中AE⊥BC于EAF⊥CD于F.求证△ABE≌△ACF.
It'sonceagainbeendeclaredtheworld'smostpopularmuseum.1.itmaynotbea2 thingfortheLouvre卢浮宫inParis. Themuseumbrokeitsown3in2018welcoming10.2million4andclaimingthetopspotinanindexoftheworld'smost﹣visitedmuseums. ButtheLouvre'suptick小幅上升invisitorsis5toomuchformanyofitsworkers 6byreceptionandsecuritystaffoverthenumberoftourists7throughitsdoorshavehitopeninghoursthroughouttheweek. TheLouvreissuffocating令人窒的theworkersunionsaidinastatement.Thepublichasincreasedbymorethan20%since2009butthepalacehasnotgrownit8. Themuseumwas9onMondayandopenedlaterthanadvertisedonWednesdayduetoa10withthedissatisfiedworkers.visitorshave11outsidethebuildingthroughouttheweekandthosewithoutbookingshavebeen12. Althoughtensionswithitsworkers13themuseum'sbottomlineislooking14.TheLouvrebrokeits201215recordlastyearmarkingadramatic16fromasharpdownturninvisitsin2017thatwasduetoasuddendecreasein17inParis. Thesocialmediathatare18aboutBeyoncéandJayZ'smusic19filmedatthemuseummayhaveplayedintothatincrease. ButwhilevisitornumbersroseattheLouvreoverallattendancewasrelatively20amongthetop20museumsintheworldlastyear.Attendancegrewamongthetop20byjust0.1%from2017to2018. 1A.Moreover B.However C.Finally D.Eventually 2A.splendid B.skeptical C.tough D.sad 3A.promise B.rule C.record D.law 4A.musicians B.artists C.visitors D.volunteers 5A.acquiring B.suffering C.blaming D.proving 6A.strikes B.quarrels C.fights D.contests 7A.flooding B.jumping C.crawling D.slipping 8A.stopped B.added C.started D.paused 9A.decorated B.repaired C.visited D.closed 10A.lecture B.meeting C.speech D.lesson 11A.queued Bdined C.helped D.served 12A.turnedup B.turnedover C.turnedaway D.turnedon 13A.dieout B.payoff C.fadeaway D.goon 14A.healthy B.funny C.tiny D.cozy 15A.quality B.attendance C.photo D.worker 16A.alarm B.attack C.recovery D.prediction 17A.paintings B.products C.population D.tourism 18A.innocent B.selfish C.crazy D.generous 19A.concert B.video C.festival D.industry 20A.high B.huge C.round D.flat
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. 注意:1.每处错误及其修改均仅限一词; 只允许修改10处多者从第11处起不计分. TosupporttheactivitynameGreenTravelStartwithMeItalktomyparentsaboutmyideas.Theywereverysupportivesaytheywouldnotdriveworkfromthenon.InthefollowingweeksastheypromisedIwenttoschoolbybikeeverydaywhilemyparentswenttoworkbybus.Thoughweweretiredbutweallfelthappily.LastFridaytheclassmeetingwasheld.Someparentswereinvitedincludingmyfatherandmother.Wesharedourthoughtduringthemeeting.Allofusheldthesameviewwhichenvironmentalprotectionissoimportantforourlife.
Outof89sitesgivenspecialprotectionduetothequalityoftheirlandscapeplanningpermissionforturbines轮机hasbeenapprovedat14. AffectedareasrangefromCornwalltotheLakeDistricttheOuterHebridesandtheShetlandIslands.Peopleclaimthattheprojectswouldspoilmuch﹣lovedviewsandhavecalledforclearerrulesonwherewindfarmscanandcannotbebuilt. Environmentalistshavecalledforachangeintheplanningsystemandsaythecurrentarrangementhasledtoafree﹣to﹣allamongwindfarmdevelopersInCornwallplanstobuild20turbineseach415ftinheight﹣tallerthanBigBenorStPaul'sCathedral﹣onlandnexttoBodminMoorhavebeenapprovedbythelocalcouncildespiteoppositionfromFriendsoftheEarththeRSPBandNaturalEngland.ExpertshavesaidtheturbineswillbevisiblefrommuchofBodminMoorandwillhaveahugeimpactonadistinctiveareaoflandseape. Theareaisalsohometomorethanonemillionstarlings八哥鸟andtothousandsofgoldenplover千鸟aprotectedspecies.Conservationistsestimatethat16000starlingsanddozensofgoldenploverwouldbekilledeveryyearbytheturbines ArthurBoytthechairmanoftheStopTurbinesinNorthCorwallcampaigngroupsaidThisareaofCornwallisfamousforthesceneryandtheviews.Itisawildandbeautifulareaofcountryside.Thewindfarmwouldviolatewhatisaverypeacefuldistinctandbeautifullandscapeandreduceittoinsignificancebehindthoseturbines. ButCharlesAnglinoftheBritishWindEnergyAssociationwhichrepresentstheindustrysaiddecisionsshouldbemadeonacase﹣by﹣casebasis. HesaidhebiggestthreattotheUk'sandtheworldshabitatsandwildlifeisdisastrousclimatechange.Todoanythingaboutthatwehavetochangethewayweuseandproduceenergyandthatdoesmeanexpandingtheamountofrenewableenergyweuse. Thelocalimpactisveryimportantbutit'spartofthewiderimpact.Wewouldbeshootingourselvesinthefootifwerejectedwindoutofhandbecauseofpurelylocalconsiderations. 1Accordingtothepassagewhatwillbeinfluencedbythebuildingofturbines A.Thelivingplacesoflocalanimals. B.Quietandnaturalscenery. C.Beautifullandscape. D.Alloftheabove. 2ThepurposeofmentioningtwofamouslandmarksBigBenandStPaul'sCathedralisto. A.makeadvertisementsforBritishtourism. B.showhowhighthesetwobuildingsare. C.comparetheheightofturbinestothem. D.expresstheauthorssurpriseattheheight. 3WhatcanweInferfromCharlesAnglinswords A.Anaturaldisasteriscoming. B.Theimpactshouldbeconsideredfirst. C.Weshouldmakedecisionsbasedontheconditions. D.Expansionofrenewableenergyisthesolutiontoclimatechange. 4What'sthemainideaofthepassage A.ClimatechangeonEarthistooserious. B.Peoplecallforrulesonthebuildingofturbines. C.BuildingturbineshasarousedargumentsinBritain. D.Alotoforganizationsaretakingactionstoprotectourenvironment.
小明和小刚用如图所示的两个转盘做游戏游戏规则如下分别旋转两个转盘当两个转盘所转到的数字之积为奇数时小明得2分当所转到的数字之积为偶数时小刚得1分.这个游戏对双方公平吗若公平说明理由.若不公平如何修改规则才能使游戏对双方公平
画一个正方体的三种平面展开图要求展开图是中心对称图形. 画出的图是正方体的展开图但不是中心对称图形每种可得2分.
DaveMerryandhistoolshavebeenthroughalottogether.ThetoolshelpedDavenow80repairhishomeinSt.PaulMinnesotawhereheandhiswifeAnnetteMerrylivedfor46yearsandraisedthreechildren.Thetablesawthejointerplanethedrillpressandthedozensofotherpowerandhandtoolshadprideofplaceinhiscarefullyorganizedworkshop.'Ihadawholesetupanditwasbeautiful'saysDavearetiredengineer.ButthenAnnetteexperiencedastroke中风thatleftherrelyingonawalkertogetaroundandtheMerrysdecidedtomoveintoassistedliving.Dave'sworkshopwasobviouslyaminorconsiderationgivenAnnette'sconditionbutthefamilyknewthatgivingitupontopofeverythingelsewouldhurt.ItwastheMerrys'daughterwhocameupwithapossiblesolution.She'dheardaboutsomepeoplewhoweresettingupatoollibrary﹣anonprofitfacilitythatwouldlendouttoolsjustasaregularlibrarylendsbooks.MightDadbeinterestedindonatinghis'Isaidyes'Davesays.ThepeoplecreatingtheSt.PaulToolLibrarywerethrilled.Theyhadexpecteditwouldtakeayeartocollectenoughtoolstomaketheirfacilityfullyfunctional.Insteadittookoneday:thedayDavedonatedhis.Thelibrary'sfoundersdroveovertotheMerrys'houseandpickedeverythingupthemselves.ThelibraryishousedinthebasementoftheAmericanCanFactory.Memberspayanannualfeefrom﹩20to﹩120forunlimitedtooluseandavaryingnumberofvisitstotheworkshop.Andtheygetanextrabenefit:DaveMerry.'Almosteverytimewe'reopenDave'shere'saysoneofthefoundersPeterHoh.'Itmeansalottometobeabletogoandusemytools'Davesays.'ButitmeansjustasmuchtohelpDIYersusethetoolsproperly.'AsHohputsit'Thisishisworkshopnow.'1WhatdoweknowaboutDaveMerryA.HehadfewDIYtools.B.Hekepthistoolswell.C.Heownedatoollibrary.D.Heusedawalkingstickafterstroke.2HowdidthedaughterhelpherparentsA.ShetookoverDad'sworkshop.B.SheofferedDadusefulinformation.C.Shemovedthemintoassistedliving.D.ShesoldDad'stoolstoatoollibrary.3WhatisavailabletothevisitorstotheSt.PaulToolLibraryA.Freeuseofthetools.B.AvisittotheMerrys'house.C.Dave'sinstructionsforusingthetools.D.Hoh'sshareoftheprofitfromthelibrary.4WhatcanbeasuitabletitleforthetextA.ArtofLivingB.SettingupaLibraryC.AFamily﹣runLibraryD.RecyclingThroughDonating
把两个全等的直角三角板ABC和EFG叠放在一起使三角板EFG的直角顶点G与三角板ABC的斜边中点O重合其中∠B=∠F=30°斜边AB和EF长均为4. 1当EG⊥AC于点KGF⊥BC于点H时如图①求GHGK的值 2现将三角板EFG由图①所示的位置绕O点沿逆时针方向旋转旋转角α满足条件0°<α<30°如图②EG交AC于点KGF交BC于点HGHGK的值是否改变证明你发现的结论 3三角板EFG由图①所示的位置绕O点逆时针旋转一周是否存在某位置使△BFG是等腰三角形若存在请直接写出相应的旋转角α精确到0.1°cos73.2°≈0.29若不存在说明理由.
WealwaysknewourdaughterKendallwasgoingbeaperformerofsomesort.She1peopleinoursmalltownbyputtingonshowsandsingingonourfrontporchwhenshewasonlythreeorfour. WhenKendallwasfivewebeganto2thatshewasblinkingalotandclearingherthroat3.Wehadhertestedforallergiesbutthedoctorsaidshewasn'tallergictoanythingatall.Aftertheproblem4wetookhertoourlocalchildren's5whereshewasdiagnosedwithTourette'sSyndrome. Itwasprettydevastating令人悲痛的becauseotherchildrenconstantlymadefunofherandsadlyevenateacher6her.Sheonlyhadoneortwofriendsbutthatwasokaybecausetheywere﹣﹣andcontinuetobe﹣﹣realthekindwho7hernomatterwhat.ThroughallthisKendallcontinuedtosingandentertain.Toour8herproblemdisappearedwhenshesang. In2005whenKendallwassixteen.wethoughtshewasprettymuchoutofthewoods﹣oratleastheadinginthatdirection9asifTourette'sSyndromewasn'tenoughforabeautifulyounggirltodealwithastrangeaccidenthappenedAtabirthdaypartyKendallwasseriouslyhurtinagameandwas10tothehospitalwhereshespentthenextweekparalyzedfromtheneckdown.Ironicallyherbiggest11wasn'twhethershewouldwalkagainbutwhethershewouldbeabletoaudition试镜forAmericanIdol. Sometimesweall12becauseofthepainwewitnessedButonthedayKendallwalkedintothestadiumtoauditionforAmericanIdol﹣an13threemonthsafterheraccident﹣wecriedtearsof14.AndourtearsturnedintoshoutswhenshewasgivenagoldentickettoHollywood. Kendalliseighteennowlivingeverydaytoits15.She'srecordedaCD.She'salsoonCMT'sMusicCityMadnessforanoriginalsongandvideoandishavingsomegoodsuccess. Whenshewasalittlegirltryinghardtobestrongshelooked16atme.herbigeyesfilledwithtearsandaskedmewhyshehadtohaveTourette'sSyndrome.Myheart17tomaketheworldrightformychild.ButIlookedrightbackatherandtoldherthe18asIseeit. KendallGodgaveyoua19heartanangelicvoiceastrongmindandabeautifulappearance.Withallofthat.hehadtomakeit20foreveryoneelse. 1A.treated B.entertained C.attracted D.showed 2A.notice B.know C.assume D.predict 3A.regularly B.fluently C.loudly D.frequently 4A.improved B.changed C.worsened D.arose 5A.school B.hospital C.museum D.charity 6A.helped B.comforted C.abused D.teased 7A.stickby B.turnto C.lookafter D.associatewith 8A.luck B.sorrow C.delight D.disappointment 9A.Therefore B.However C.Anyway D.Besides 10A.walked B.accompanied C.rushed D.invited 11A.concern B.dream C.problem D.disease 12A.laughed B.worried C.panicked D.cried 13A.mere B.uneasy C.precious D.desperate 14A.sadness B.despair C.joy D.regret 15A.happiest B.fullest C.simplest D.busiest 16A.down B.around C.forward D.up 17A.ached B.relieved C.lightened D.moved 18A.way B.story C.news D.truth 19A.sick B.broken C.pure D.fragile 20A.right B.similar C.different D.fair
假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除和修改. 增加:在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. DearTom HowisitgoingKnowingthatyouareinterestinginChinesecalligraphyI'mwritingtotellyouit'smypleasuretohelpyoulearnthem. AsIhavebeenpracticingitformanyyearsIhavemuchvaluableexperienceandknowexactwhatyouneedforcalligraphy.SoIwillpreparesometoolthatareofgreatuseforyoulikethewritingbrushinkandpaperthatarenecessaryforpracticingcalligraphy.AsyouknowIhadpianolessonsfromMondaytoSunday.IwillbefreeonSundayafternoon.Thusyoucancometomyhomeat2:00p.m.oneverySundayifitisconvenientforyou. I'msurethatbylearnChinesecalligraphyyouwillhaveagoodunderstandingofChineseculturethaneverbefore.I'mlookingforwardyourreply. Yourssincerely LiHua
假如你是李华你的笔友Peter听说高考即将来临想了解一下你们如何备战高考请你回一封邮件说明相关情视内容包括: 1.想方设法掌握知识; 2.保持精力充沛 …… 注意:1.词数100左右 2.可以适当增加细节以使行文连贯; 3.开头和结尾已给出不计入总词数. DearPeter Iammorethandelightedtohearfromyou. Lookingforwardtoyourearlyreply! Yours LiHua
下列物品所使用的材料属于有机合成材料的是
IntheworldofdigitalhealthSiliconValley﹣basedMindstrongstandsout.Ithasaremarkableteamandtensofmillionsoffunding.Italsohasafascinatingidea﹣itsappbasedonmentalfunctioningresearchcanhelpdetecttroublingmentalhealthpatternsbycollectingdataonaperson'ssmartphoneusage﹣howquicklytheytypeforinstance. Thecompany'sappcollectsinformationabouthowpeoplearetypingandrunsitthroughamachinelearningalgorithm计算程序todeterminewhichdatacanpredicttheiremotionalstate.Theideaistousethatdatatoestablishanormalpattern﹣soitcanbecomparedwithsomeone'stypinghabitsonanygivenday.Ifthehabitschangeslowerormoreanxiousthannormaltheappcanwarnahealthcareprovider. ThepromiseofthistechnologyhasmadeMindstrongincrediblypopularsinceitwaslaunchedlastyear;alreadymorethanadozencountiesinCaliforniahaveagreedtoapplythecompany'sapptopatients.DoestheappliveuptoitspromiseThere'snowaytotell.Almostnooneoutsidethecompanyhasanyideawhetheritworksleadingsomeexpertstowonderifthetechnologyisreadyfortherealworld.Iwouldn'twasteallthattimeandmoneyinthewilduntiltheygetsurethatsomeofthosethingsareasspecificastheyhopetheyaresaidRosalindPicardaresearcheratMITMediaLabwhoisfamiliarwithMindstrong'swork. Ithaspassedthegold﹣standardclinicaltestsfordepressionandanxietysaidDr.PaulDagumthecompany'sfounder.We'reconfidentandwe'realreadyseeingsomereallyexcitingresults.Mindstrongofficialssaidthatamongtheirmostencouragingresultsisthatitsappcanevenpredicthowapersonwillfeelnextweekkindoflikeaweatherappforyourmood.Foraclinicianorsomeonelookingafterapatienttheyknowthatitcouldbeveryverypowerful.Dagumsaid. 1WhatcanMindstrongsappdo A.Improveitsusers'mentalhealth B.Getitsuserstotypemorequickly. C.Discoveritsusers'mentalstate. D.Workoutthecausesofitsuser'trouble 2Whatisthesecondparagraphmainlyabout A.Thewaysofcollectingdata. B.Theapp'sworkingprinciple. C.Theanalysisoftypinghabits D.Thedevelopmentoftheapp 3WhatisRosalindPicard'sattitudetowardstheapp A.Skeptical B.Positive C.Uncaring D.Defensive 4WhatcanweinferaboutDagum'sopinionontheapp A.Theapphasapowerfuleffectonanxiety. B.Theappcanalsopredictweatherconditions. C.Careproviderscouldbeadvocatesoftheapp. D.Doctorsbenefitmorefromtheappthantheirpatients.
假定你是李华你的美国朋友Peter正在你们学校开展为期两周的交流活动.请你给他写封邮件邀请他一起去郊游欣赏中国美丽乡村.内容包括: 1.时间和地点; 2.特色乡村文化体验如赏美景看演出品美食等 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯.
WhenIwasaboyourextendedimmigrantfamilywouldsometimesgatheratmyaunt'stinyhouseoverthesummer.Relativesfromalloverthecountrywouldcomeintovisit.Theadultswouldcrowdtogetherinthelivingroomtotalkandcatchuponeachother'slives.Andthekidswouldbesentoutintothefrontyardtoplaywhendinnerwasslowlycookedforallofus. Thosewerethedaysbeforevideogamessmartphonesandmotorizedtoyssoweoftenendedupplayinganoldgame.Irememberoneofthosemomentsespecially.AsIwastheyoungestandsmallestofallthekidsthereIgotcaughtfirstandcouldn'tcatchanyoneelse.MybrothersandcousinswerealltoofastformeandIgrewmoreandmorefrustrated.Ifinallyfellmyfacefirstintothedirt.Igotupwithtearsforminginmyeyes.ThenIsawoneofmyfemalecousinsSusanstandingthere.Shestartedtorunbutwasgoingmuchslowerthanbefore.Ieasilycaughtupandseizedher.ThensheturnedtomesmiledandsaidI'mit!Youdbetterrun!Iranofflaughingwithgleewhilesheturnedandstartedtochaseothers. NowIseehowheractofkindnessthatdaysavedmefromsadnessandreturnedmetojoy.Itdidn'tmatterthatwehardlyeversaweachother.Iknowwearefamilyandshelovesme. Inherwonderfulbook:BoxofButterfliesRomaDowneywritesWearealloneweallbelongtoeachotherandweareonebig.beautifulfamily.Perhapsitistimethatweallstartedtotreateachotherthatway.Perhapsitistimethatwesharedourloveourkindnessourlaughterandourjoywitheveryonewithoutfear.Perhapsitistimetofinallyandforeverbringthisworldtogetherinonebigfamilyreunion. 1Whentheadultswerechattingthekidswould. A.playvideogames B.sitinthefrontyard C.learntocookdinner D.playtraditionalgames 2TheauthorwasabletocatchSusanbecause A.theothersrantoofast B.theauthorwasgoodatrunning C.Susangaveherachance D.Susanwantedtochaseothers 3Whatcanbeinferredfromthepassage A.TheauthorisgratefulforhatSusandidtoher. B.TheauthorcantmeetSusananymore. C.Theauthorurgesotherstolovetheirfamily. D.Theauthorbelievestheworldwillbecomeabigfamily 4Whatcouldbethebesttitleofthepassage A.Amemoryofmychildhood. B.Sharingofgoodnessunitesus C.Kindnessbrightensourlife. D.Agooddeedisinvaluable
如图作等边△ABC取AC的中点D以AD为边向△ABC形外作等边△ADE取AE的中点G再以EG为边作等边△EFG如此反复当作出第6个三角形时若AB=4整个图形的外围周长是.
“白象”方便面的主要配料如下其中蛋白质含量丰富的是
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