首页
试卷库
试题库
当前位置：
X题卡
>
所有题目
>
题目详情
正六边形内接于圆，它的边所对的圆周角是（ ）
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
距资料我国古代数学家祖冲之和他的儿子发展了刘徽的割圆术即圆的内接正多边形边数不断增加它的周长就越接
2.9
3
3.1
3.14
下列命题中真命题的个数是①平分弦的直径垂直于弦②圆内接平行四边形必为矩形③90°的圆周角所对的弦是直
5
4
3
2
刘徵是我国古代最杰出的数学家之一他在九算术圆田术中用割圆术证明了圆面积的精确公式并给出了计算圆周率
回顾旧知在探究有关正多边形的有关性质时我们是从那几个方面展开的探究的方法与过程又是怎样的不要求回答温
如图⊙O.与正六边形OABCDE的边OAOE分别交于点F.G.则弧FG所对的圆周角∠FPG的大小为_
在⊙O.中若弦AB是圆内接正边形的边弦AC是圆内接正六边形的边则∠BAC=
在⊙O.中若弦AB是圆内接正四边形的边弦AC是圆内接正六边形的边则∠BAC=▲.
小明发现相机快门打开过程中光圈大小变化如图1所示于是他绘制了如图2所示的图形.图2中留个形状大小都相
如果圆的内接正六边形的边长为6cm则其外接圆的半径为
已知一个圆的半径为5cm则它的内接正六边形的边长为__________
正六边形ABCDEF内接于⊙O⊙O.的半径为6则该正六边形的面积为
刘徽是我国古代最杰出的数学家之一他在九章算术圆田术中用割圆术证明了圆面积的精确公式并给出了计算圆周
圆内接正六边形的边心距为则这个正六边形的面积为cm2.
半径为2的圆内接正三角形正四边形正六边形的边心距之比为.
已知正六边形内接于圆它的边所对的圆周角是
60°
120°
60°或120°
30°或150°
如图⊙O.与正六边形OABCDE的边OAOE分别交于点F.G.则弧FG所对的圆周角∠FPG的大小为_
圆内接正六边形的边长是8cm则该正六边形的半径为．
圆内接正六边形的一条边所对的圆心角的度数为.
作图题在已知圆内作内接正六边形
半径为6的圆内接正六边形的边长等于________.
热门试题
更多
用稀硫酸和氢氧化钠溶液进行中和反应的实验时反应过程中溶液的pH变化如图所示． 1该实验是将选填“稀硫酸”或“氢氧化钠溶液”滴加到另一种溶液中． 2当溶液中溶质的质量为bg时所得溶液中的溶质为写化学式 3完全中和一定量的某硫酸溶液需要100g8%的NaOH溶液若改用100g8%的KOH溶液则反应后溶液的pH7填“＞”“＜”或“＝”．
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.
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.
某无土栽培的营养液中含有磷酸二氢铵NH4H2PO4．下列有关说法不正确的是
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.
下列各组物质中只需适量NaOH或其溶液就能将括号内杂质除去的是
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
工业烟气脱硫就是将烟气中含有的二氧化硫除去．一种采用“双碱法”脱硫的工业流程示意图如图已知亚硫酸钙难溶于水 1吸收塔中用NaOH溶液吸收SO2生成和H2O． 2沉淀室中发生反应的化学方程式为． 3上述流程中可以循环利用的物质是有利于节约成本．
将一定质量的CO和CO2的混合气体通入足量的石灰水中充分反应后生成的沉淀质量恰好等于原混合气体的质量则原混合气体中CO和CO2的分子个数比为
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.
小明参加2016年体育中招考试期间的午餐食谱如表所示． 1从营养均衡方面考虑还应该补充的营养物质是． 2红烧牛肉时用的加铁酱油和加碘食盐中所含微量元素的符号为．
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
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
将下列各组内的物质混合所得溶液的质量比反应前溶液质量减少的是
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.
“白象”方便面的主要配料如下其中蛋白质含量丰富的是
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
湘公网安备 43130202000226号