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把一根长度为7的铁丝截成3段，如果三段的长度均为正整数，则能构成三角形的概率为（ ）
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高一上学期数学《》真题及答案
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将长度为的线段分成段每段长度均为正整数并要求这段中的任意三段都不能构成三角形.例如当时只可以分为长度
把一根铁丝截成两段第一段长米第二段长度占总长度的两段铁丝相比
第一段长
第二段长
一样长
无法比较
把一根铁丝截成两段第一段长米第二段占全长的那么两段铁丝长度相比较的结果是
第一段长
第二段长
两段相等
无法确定
现有长为57cm的铁丝要截成nn＞2小段每小段的长度为不小于1cm的整数如果其中任意3小段都不能拼成
一根木条截成三段第一段长3米第二段长4米第三段长5米每段木条各占总长度的几分之几
把一根木棒截成三段要用6分钟照这样计算如果截成四段要用分钟．
6
8
9
12
将一根长度为15的细木棒成长度为整数的三段以它们为一个三角形的三边可以得到不同的三角形的个数为
8
7
6
5
一根铁丝分成3段第一段长6米第二段长8米第三段长10米．每段各占总长度的几分之几
有一根电阻丝阻值为30Ω将它剪成相等长度的三段每段的电阻值为Ω
10
30
60
90
把一根18厘米长的小棒截成三段围成一个等腰三角形每段都是整厘米数一共有多种截法是怎样截的请把每种截法
把一根长度为 7 的铁丝截成三段如果三段铁丝长度均为正整数则这三段铁丝能构成三角形的概率为
1
4
1
3
1
2
3
4
把一根10厘米长的彩带截成三段整厘米其中一段长3厘米．要使截成的三段能围成一个三角形则另外两段的长
把一根木棒截成三段要用6分钟照这样计算如果截成四段要用分钟．
6
8
9
12
将长度为8厘米的木棍截成三段每段长度均为整数厘米．如果截成的三段木棍长度分别相同算作同一种截法如5
把一根长度为7的铁丝截成任意长的3段则能构成三角形的概率为
将一根长为 a 的铁丝随意截成三段构成一个三角形此事件是____________事件.
把一根木棒截成四段要用a分钟照这样计算如果截成三段要用分钟．
将长度为9厘米的木棍截成三段每段长度均为整数．那么截成的三段木棍能构成等腰三角形的概率是．
将一根铁丝切割成三段做一个面积为2m2形状为直角三角形的框架在下列四种长度的铁丝中选用最合理够用且浪
将长度为8厘米的木棍截成三段每段长度均为整数厘米．如果截成的三段木棍长度分别相同算作同一种截法如5
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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;2.只允许修改10处多者从第11处起不计分.Itisessentialtotakeanusefulsummervacationaftertheexam.Therearemanykindsofactivityforustotakepart.Firstwecanvisitourrelativesandfriendsorspendahappilytimewithourfamily.Secondseeingafilmlisteningtomusicorhangoutwithourfriendswillalsobeexcited.Thirdweshouldtakemoreexercisetokeephealthy.What'smorewe'dbettertoreviewwhatwehadlearnedatschool.Finallyitisnecessaryofustodosomehouseworkthatcanhelpourparentsalot.AboveallIhopeallofuscanhaveapleasantvacation.
TheWorld'sGreatestBookstores CafebreriaElPénduloMexicoCityMexico PartcafepartcoffeehousepartbarandpartbookstoreCafebreriaElPénduloislocatedinMexicoCity.Bookslinetheshelvesfromtheceilingtothefloorandliveplantsaddlotsofgreen.Thestoreisnamedforahugependulum钟摆hangingfromitsceiling. StanfordsLondonandBristolEngland Establishedin1853Stanfordsboaststhatitofferstheworld'slargestselectionoftravelbooksandmaps.Italsosellstravelaccessories.LookfortheenormousNationalGeographicMapoftheWorldintheflagshipstoreinLondon;itwascreatedin2003tocelebratethestore's150thbirthday. RizzoliNewYorkCityNewYork ForalmostahalfcenturyRizzolihasbeenconsideredasoneofthebestindependentbookstoresintheUS.Itspecializesinillustrated有插图的booksaboutthewaypeopleworksandlivessuchasfashionphotographydecorationdesigncookingandarchitecture.Takeamasterclassinflowerdesignattendalectureandbooksigningordropinforacookingshoworbookalaunchparty. ElAteneoGrandSplendidBuenosAiresArgentina Oftendescribedasoneoftheworld'smostbeautifulbookstoresElAteneoishousedinanhistorictheatermuchasitwaswhenthetheateropenedin1919.Aftercustomersbrowsetheshelvestheycandrinkcoffeeandlistentomusicfromastagehiddeninredcurtainswheretangodancersonceperformed.Whilemostofthestore'sbooksareinSpanishtheyareavailableinarangeofsubjects. 1WhatisCafebreriaElPéndulonotedfor? A.Thelargershelves. B.Itsuniquesymbol. C.Thetastycoffee. D.Itsinterestinglocation. 2Whichbookstoreisthebestchoicefortravellerstobuyatouristhandbook? A.Rizzoli. B.Stanfords. C.ElAteneoGrandSplendid. D.CafebreriaElPéndulo. 3WhatsubjectarebooksinRizzoliabout? A.History. B.Cartoon. C.Lifestyle. D.Literature.
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WHO'SWHOINTHEZOO? IsitamazingthattheWHO'SWHOINTHEZOOmakesitfunforyoungchildrentosave?WiththehelpofStandardBank'sKidzAPPandtheBigFiveanimalfriendsteachingyourchildrenaboutmanagingtheircashhasneverbeenmorefun.LettheWHO'SWHOINTHEZOOshowyourlittleoneswhatitmeanstoearnandsavemoneyaswellasshareintheenjoymentofspendingtheirwell﹣earnedcash. Elephant Asyourchildrenusethemobileapptocompletevariousactions﹣achievingsavingsgoalscompletingmissionsandachievingwishes﹣herevariousmedalswillberewarded. Earnedmedalsaredisplayedintheelephanthabitataswellaslockedmedalsstilltobeachieved. Leopard Rewardyourkidswithpocketmoneyforcompleting‘missions':householdchoresachievementsetc. Youcancreateamissionforyourchildoryourchildcanrequestanewmission.Oncecreateditmustbeaccepted.Themissionneedstobecompletedbyyourchildandapprovedbyyoubeforeyoucanpayhimorher. Lion Helpyourchildrencreateandfulfilwishes.Wishcardsandtheirsavingsprogresscanbetrackedfromyourbankingapp. Oncetheirsavingsgoalisreachedlionwillinformyouoftheirachievement. Buffalo Kidzcanrequesttowithdrawcashorpurchaseairtimeanddatausingtheirsavings. Rhino Rhinoshowsyourchild'slatestaccountbalanceandtransactions. DownloadtheStandardBank'sKidzAPPfromAppleAppStoreonthephone.UsethecommentsectiontointeractwithotherStandardBankcustomersandbankconsultants. 1WhatistheWHO'SWHOINTHEZOOdesignedfor? A.Playersofboardgames. B.Kidsforself﹣servicebanking. C.Parentsforonlinebanking. D.Travelersinthezoo. 2Rewardswillbepaidif. A.thekidsfulfilyourcreatedmissions B.yourkidsgetenoughlockedmedals C.youkeeptheaccountbalanced D.youapprovetherequestviaKidzAPP 3Whichofthefollowinganimalsisrelatedtospending? A.Rhino. B.Leopard. C.Lion. D.Buffalo.
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已知等比数列{an}前n项和为Sna1＝1且Sn＝2an﹣a1． 1求数列{an的通项公式 2求数列{nan}的前n项和Tn．
Ofallthepotentialconsequencesofclimatechange一risingsealevelsdesertificationflood一here'sonethatmaynotcatchyourattention;risingtemperaturesareturningyounggreenseaturtle海龟populationsalmostentirelyfemaleaccordingtoanewstudypublishedinCurrentBiology.ThisisoneofthemostimportantconservationpapersofthedecadeDavidOwensabiologistnotparticipatingintheresearchtoldtheWashingtonPost. Thestudylookedat200000nestingfemalesalongtheeastcoastofQueenslandAustralia一hometooneoftheworld'slargestgreenseaturtlepopulations.Researchersfoundalittlefemalesexbias偏差inthecoolersouthernGreatBarrierReefwith65to69percentofbabyturtlesbornfemale.Butinthewarmernorthernparttheyfoundanextremelyfemalesexbiaswheremorethan99percentofyoungturtleswerefemales.Overall86.8percentofadult﹣sizedturtlesintheentireareawerefemales. Withaverageglobaltemperaturepredictedtoincrease4.7degreesFahrenheitby2100manyseaturtlepopulationsareindangerofhigheggdeathandfemale﹣onlybabyturtleproductionthereportwarned.Thetrendofmorefemalesbeingborninwarmerareashasbeenobservedforafewdecadesbutbiologistswereunawareofhowbigtheseximbalancehadbecome. Biologistsconsider84.74degreesFahrenheittobethekeytemperatureforgreenseaturtlestohebornamixtureoffemalesandmales.Acoupleofdegreesbelowandyougetmostlymales;acoupleofdegreeshigherandyougetmostlyfemales. DermotO'GormanchiefadministratorofWorldWildlifeFundAustraliathinksanydangerstoseaturtlesarelikelytoaffectentireoceanecosystems.Therearesomepotentialquickfixeslikesettingupshadeclothtocoolbeachesandreducingturtlefishingtoinsureadultmalesstayinthepopulation.Buttheonlyeffectivesolutionistostopthechangeintheworld'sclimatehesays. 1WhatdidtheresearcherfindinthenorthernGreatBarrierReef? A.Nearlyallbabyturtleswerebornfemale. B.Turtleseximbalanceincreasinglyreduced. C.Therewereequalamountsofmalesandfemales. D.Thereexistedtheworld'slargestpopulationofseaturtles. 2Whatcanwelearnaboutgreenseaturtles? A.Warmertemperaturemeanlessfemales. B.Theirsexrateisdeterminedbytemperature. C.Theireggshatchmorequicklyincoolerplaces. D.Theirnestsproducethehealthiestmalesat84.74°F. 3WhatdoesDermotstressparticularlyindealingwithseaturtleproblem? A.Preventingclimatechange. B.Protectingadultmaleturtles. C.Usingshadeclothtocoolbeaches. D.Banningpeoplefromfishingturtles. 4What'sthemainideaofthetext? A.Seaturtlesreminduswhat'sgoingonintheoceans. B.Climatechangeisturningbabygreenseaturtlesfemale. C.It'stimetorealizethepotentialeffectsofglobalwarming. D.Risingtemperatureshavecausedseriousproblemstowildlife.
IwasstressedoutwhenIwasstudyingformygraduateprogram.Justafewmonthsbeforethegraduation1IhadtoldmymornthatImight2graduateschool.Shelistenedtomy3andsheadmittedforthefirsttimeinourhistoryshewasabit4.Howevershesaidshelovedmeandshe5howmuchstressIwasunder.ThenshetoldmeIwas6thanthisandencouragedmetotakesometimeto7it. SoIdid.IspentthesummerbeforeIwentbacktoschool8whatIhaddonesofarandwhatIhad9todo.Asacreativewriting10Ihadtakenallofmyrequiredcourses.Allthatremainedinmylastyearwere11coursesandmyresearchhours.Ialsohadtwomajorexamsgraduatepapersandtheoral12allduethatyear.Finallywithmymother's13Imanagedtocompletethem. 14mymomIhadafewothergraduatestudentswhoIwasabletospeaktoandprofessors15meintotheirofficeswheneverIneededhelp.They16atmygraduationpartymygoingawaypartyandonmysocialmedia.Graduateschoolwas17stressfulbutwithoutitIwouldneverhaveknownhowstrongandindependentIreallywasandIwouldneverhave18thefriendsIdid. TrustmewhenIsaythatyou19canturnyourcant'sintocansandachieveyourdreams.Allittakesissome20determinationandwillpower. 1A.year B.project C.exam D.anniversary 2A.graduatefrom B.dropoutof C.adjustto D.breakawayfrom 3A.sorrow B.interest C.anxiety D.anger 4A.amused B.embarrassed C.moved D.disappointed 5A.understood B.roved C.promised D.regretted 6A.luckier B.weaker C.cleverer D.stronger 7A.explain B.resist C.consider D.accept 8A.suspecting B.declaring C.guaranteeing D.reflecting 9A.left B.interrupted C.searched D.avoided 10A.tutor B.major C.fan D.model 11A.active B.training C.optional D.writing 12A.argument B.defense C.charge D.bargain 13A.permission B.payment C.encouragement D.control 14A.Regardlessof B.Inexchangefor C.Owingto D.Inadditionto 15A.persuaded B.welcomed C.forbade D.ignored 16A.lookedout B.hungaround C.madeup D.showedup 17A.obviously B.occasionally C.hardly D.hopefully 18A.betrayed B.made C.accompanied D.offended 19A.again B.only C.too D.already 20A.support B.respect C.attraction D.impression
Chinahascompleteditshome﹣grownBeiDouNavigation导航SatelliteSystemBDSwiththesuccessful﹣launchoftwomoreBDS﹣3satellites19inallandhasstartedprovidingservicestocountriesparticipatingintheBeltandRoadInitiativeBRIsincetheendof2018. TheBDSwhichwillcompeteagainsttheUS'GlobalPositioningSystemGPSwillprovidehigh﹣precisionreliablepositioningnavigationandtimingservicesanywhereintheworldbytheendof2020. TheBeltandRoadInitiativeisanambitiousefforttoimproveregionalcooperationandconnectivityinatrans﹣continentalrange.Theinitiativeaimstostrengtheninfrastructure基础设施tradeandinvestmentlinksbetweenChinaandsome65othercountries.ItisalsoexpectedtoincreaseBeijing'sinfluenceinthesecountries. ThisisakeystepfortheBDSdevelopingfromaChinesehomesystemtoaregionalandthenaglobalnavigationsystemsaidYangChangfengchiefdesigneroftheBeiDousystem Chinaplanstolaunchanother11BDS﹣3satellitesbetweentheendof2018and2020.ChinadevelopedtheBDSthroughauniquetechnologicalapproachcontributingChinesewisdomtothetheoryandconstructionofinternationalsatellitenavigationsystems. Altogether18BDSsatelliteshavebeensentintospacein2018makingthisyearthemostintensivelaunchoftheBDSsatellites.Theyimprovedtheirworkefficiencybyreformingthemanagementprocess.Thenumberofsatellitestaffatthelaunchcenterhasbeenreducedbynearlyhalfandthetestingtimebeforelaunchhasbeenshortenedbynearlyathird.IntheCASTproductionbaseinBeijingseveralBDSsatellitesarebeingmanufacturedatthesametime.Theytrytoimproveintelligentmanufacturingcapabilityandcutdownproductiontimes.ConstructionoftheBDS﹣3systemhasaccelerated. OncetheBDSisfullycompleteditwillbethefourthglobalsatellitenavigationsystemaftertheUSGPSsystemRussia'sGLONASSandtheEuropeanUnion'sGalileo.IndiatooisbuildingitsnavigationalsystemcalledtheIndianRegionalNavigationSatelliteSystemIRNSSwithanoperationalnameofNAVIC. 1WhencantheBDSofferglobalservices? A.In2018. B.In2019. C.In2020. D.In2025. 2WhatcantheBDSdonow? A.TaketheplaceoftheGPSoftheUSA B.Watchanyoneanywhereintheworld. C.ControltheBeltandRoadcountries. D.ServetheBeltandRoadInitiative. 3Whatdoesparagraph4mainlytalkabout? A.TheuniquecharactersoftheBDS. B.TheChinesetechnologyoftheBDS. C.TheeffortsofthestaffoftheBDS. D.ThedifficultiestheBDShastodealwith. 4Whatcanbethebesttitleforthetext? A.China'sBDSisapproachingitsgoalstepbystep B.China'sBDShasbecomethefourthglobalsatellitenavigationsystem C.China'sBDShelpsBRIincreaseBeijing'sinternationalinfluence D.TheuniquetechnologicalapproachmakesChina'sBDSoutstanding
Eveniftreescannotwalktheyarestillonthemove. InpartsoftheArcticentireforestsaremovingnorthward.AcrosstheArctictemperaturesarerisingfasterthananywhereelseintheworld.Asthathappensthetreelinethatmarkswhereforestsstopandthetreelesstundra冻原startshasbeenshiftingnorthward.Treesgrowingalongthetreelinemustprotectthemselvesfromthecoldwind.Todothisplantstendtogrowhorizontal水平的brancheslowtotheground.Theenergyittakesfortreestogrowthiswaymeanstheydonthaveenoughenergytomakeseeds ButasEarthsclimatehasbeenwarming.treesnolongerhavetojustgrowhorizontally.Manycaninsteadgrowuptowardthesky.Thistakeslessenergy.Andwithallthatleftoverenergythesetreeshavestartedproducingmoreseeds.Thishappensespeciallyinplaceswherewhitespruce白云杉grows. WhitesprucewhichisaNorthAmericantreeisquiteabletoproducealotofseedswhichcanmovelongdistancesinthewind.Whenwind﹣blownseedsenduponthetundrabeyondthetreelinetheyeventuallycansprout发芽newtrees.Thisexplainshowaforestcanmove.Ofcoursetheprocesswouldworkonlyifthetundrawerewarmenough.Butinrecentyearsthewholeplanethasbeenwarming. Newtreeswillprovidesheltersforsomesnowkeepingthesunsraysfrommakingthewhitesurfacedisappear.Insteadthetreesabsorbthesunsheat.Thiswarmsthesurroundingair.Theextrawarmthencouragesevenmoretreestoproduceseeds.Thatfurtherboostsaforestsabilitytoexpand.Inadditionmoretreeswilltrapmoresnowpreventingmuchofitfrombeingblownaway.Snowcantrapheatinthesoilbelowwhichencouragestreestogrow.Therecentriseoftemperatureshashelpedmoretreesgrowpastthetreeline.Peopleworryaboutimpactsontheanimalsthatdependonfrozenconditionsforfoodandshelter. 1WhatisthemaincauseofthetreesintheArcticmovingnorthward? A.Thehighertemperature B.Theabundantresources C.Thefierceandcoldwind D.Theshrinkingofnortherntundra 2WhatdoestheunderlinedwordthisinParagraph2mean? A.Toproducemoreseed B.Toresistthecoldwind C.Tomovenorthward D.Torespondtotheclimatechange 3Whatcanbeinferredfromthelastparagraph? A.Newtreescantrapthesnowwhichmaymakethesoilcolder B.Thetrappedsnowpreventsnewtreesfromproducingmoreseeds C.Newtreescanmakethesurroundingairwarmer. D.Newtreescanbringmorefoodandsheltertolocalanimals. 4Thepassageismostprobablytakenfrom. A.asciencereport B.anagriculturereport C.asciencefictionmagazine D.anastronomymagazine
BackinJanuaryIwaswatchingacollegefootballgameandcametoarealization:AsahighschoolseniorprettysoonI'llbethesameageassomeofthetopathletesintheworld. Thisrealizationwasbothconfusingandcomforting.UntilthispointI'dalwaysthoughtoftopathletesinanothergeneration.IhadnorealconnectiontopeopleinthenewsorplayingsportsonTVbecausetheyweresomucholder.Butprettysoonpeopleofmyagewillbetheonesdominating支配thenews. ThecomfortcameinunderstandingthatasIpreparetograduatefromSanfordH.CalhounHighSchoolinMerrickI'mnotthatfarofffromenteringtherealworldandIwillhaveachancetomakeanameformyself. RightnowI'mattheendofoneoflifestageswithmanymoretocome.Asseniorsmanyinmyclassdevelopedsuperioritycomplexes.We'dseebabyfacedninthgradersandthinkUghthoseannoyingfreshmen.Orwe'dhearjuniorscomplainaboutstartingthecollegeapplicationprocessandsaytoeachotherThosejuniorshavenoideawhatthey'retalkingabout.Ofcourselastyear'sseniorssaidthesamethingaboutlastyear'sjuniorsrepeatingatimelesscycle. PsychologistandauthorThomasArmstrongwritesthatlifeismadeupof12stages.Hestressesthatnostageismoreimportantthananotherandeachhasitsownuniquegifts.Thereisnohighestpointinlifenoimpressiveendingwhenyouareaboveeverybodyelse.Atthesametimethereisnolowestpointinlife;atnopointisahumanworthlessandbelowothers.Justasaninfantisn'tbeloweveryoneelseoureldersaren'taboveeveryoneelse. 1Whatcanweknowabouttheauthor? A.He'llfinishhishighschoolstudiesaboutoneyearlater. B.Reflectingonthepastisapartofhisdailyroutine. C.Footballisaparticularfavoritewithhim. D.Hedreamsofbeinganexcellentathlete. 2Whydidtheauthorfindhisrealizationcomforting? A.Thetopathletesarethesameageashim. B.Thereisapossibilitythathecanbefamous. C.Hewillbeadmittedtohisdreamuniversity. D.He'smadefullpreparationsforenteringsociety. 3WhatdoestheunderlinedphrasesuperioritycomplexesinParagraph4mean? A.Ahabitofmakingcomplaints. B.Ahabitoffollowinginothers'footsteps. C.Afeelingthatyouarebetterthanothers. D.Afeelingthatothersareunapproachable. 4Whatmessageisconveyedinthelastparagraph? A.Lifeismeanttobelivedandenjoyed. B.Lifeisneversmoothfullofupsanddowns. C.Oneshouldtrytoreachhisgreatestpotential. D.Everyonehastheirownvalueandpositioninlife.
Areyoucontentwiththeshapeofyournose?Ifnottheclimatemaybetoblamenotyourparents. AccordingtoarecentstudycarriedoutbyscientistsfromPennsylvaniaStateUniversityUSclimateplayedakeyroleinshapingournoses.Thefindingswerebasedonanexaminationofthesizeandshapeofnosesof476peoplefromfourregions﹣WestAfricaEastAsiaSouthAsiaandNorthernEuropeusing3﹣Dfacialimagingtechnology. PeoplehavethoughtforalongtimethedifferenceinnoseshapeamonghumansacrosstheworldmayhavearisenasaresultofnaturalselectionbecauseofclimateArslanZaidioneoftheleadauthorsofthestudytoldTheGuardian.ButwhilepreviousstudieswerebasedonmeasurementsfromhumanskullsZaidiandhisteamlookedatnoseshapeitself. Theresultshowedthatwidernosesaremorecommoninwarmandhumidclimatewhilenarrowernosesaremorecommonincoldanddryclimate.ThatZaidisaidcouldbebecausenarrowernasalpassageshelptoincreasethemoisture潮湿contentofairandwarmitwhichiseasieronourlungs.Thisinturnledtoagradualdecreaseinnosewidthinpopulationslivingfarawayfromtheequator. MorestudiesarestillneededtotestthelinkbetweenclimateandnoseshapebutZaidibelievesthecurrentfindingsarevaluableinunderstandingpotentialhealthissues.AswebecomemoreofaglobalcommunitywearegoingtocomeacrossclimatethatwedonotadapttohetoldTheGuardian.Thismeansmovingtoaverydifferentclimatemightincreasetheriskofbreathingproblems. HoweverheaddedThismaynotbenecessarilytrueforvariousreasonssuchasofmodernmedicineandthefactthatourcurrentclimateisverydifferentfromwhatitusedtobe. 1FromthepassageweknowmostpeoplefromSingaporehavenoses. A.wider B.narrower C.smaller D.larger 2Narrowernosesarehelpfulto. A.cooltheair B.warmtheair C.takeinmoreoxygen D.drytheair 3Whatcanbelearnedaboutthestudy? A.Zaidi'steammeasuredhumanskullsusing3﹣Dtechnology. B.Theshapeofournosesisdeterminedbyourparents. C.Noseshapehelpspeopleadapttotheenvironment. D.It'scertainthatpeoplewillsufferfrommorebreathingproblems. 4Whichofthefollowingcanbethebesttitleforthepassage? A.Whatfactorsshapenoses? B.Howtomakeyournoseattractive? C.Noseshapecausesbreathingproblems D.Climateshapesnoses
如图1水平地面上边长为L的正方形ABCD区域埋有与地面平行的金属管线．为探测金属管线的位置走向和埋覆深度先让金属管线载有电流然后用闭合的试探小线圈P穿过小线圈的磁场可视为匀强磁场在地面探测如图2所示将暴露于地面的金属管接头接到电源的一段将接地棒接到电源的另一端．这样金属管线中就有沿管线方向的电流．使线圈P在直线BD上的不同位置保持静止时线圈平面与地面平行线圈中没有感应电流．将线圈P静置于A处当线圈平面与地面平行时线圈中有感应电流当线圈平面与射线AC成37°角且保持静止时线圈中感应电流消失．下列说法正确的是已知sin37°＝0.6cos37°＝0.8
假定你是李华你的朋友Peter想了解你校于五月举办的中国传统文化艺术节.请你给Peter写封回信内容包括: 1.举办艺术节的目的; 2.介绍你最喜欢的一个艺术节活动; 3.邀请Peter参加并告之艺术节活动的时间. 注意: 1.词数100左右; 2.可以适当增加细节以使行文连贯.
某同学为了探究物体的质量不变时加速度跟合外力的关系．将力传感器固定在小车上然后把绳的一端固定在传感器挂钩上用来测量绳对小车的拉力根据所测数据在坐标系中作出了如图所示的a﹣F图象．由于疏忽实验者忘记了平衡摩察力将带滑轮的长木板固定在水平的桌面上了． 1实验中是否需要钩码的质最远小于小车和传感器的总质量填“是“或“否” 2由图象求出小车和传感器受到的摩擦阻力为N总质量为kg
Wheneveryoufeelcold.thefirstthingyoudoistoputonmoreclothes.Butitcanhappenthatyoucanfeelcolderwhenyougooutsidewiththesameamountofclotheson1youdoindoorsWhyisthis? AccordingtoTheConversationthereason2lieincoldreceptors接收器intheskin.Whenthetemperaturedrops.thesereceptorssend3signaltotellthebrainthebodytemperature.Thenbraincreates4awareoffeelingcold. 5wearmoreclothesathomeleadstoaveragebodytemperaturebeingraised.Thenthereceptorssendthebrainthesignalofa6hightemperature.Howeverwhenyougooutsideyournervoussystemlearnsthetemperature7yourskin.inparticulartheface.Asaresultthedifferenceintemperatureisnowgreaterandyoufeeltheairiscolderparticularlyonthe8exposeskin. 9accordingtoTheSun.onceyougetoveryourinitialsenseofcoldnessyourcoatwillstilldoitsjobandyou10feelitsbenefit.
Iwasalovelychildwithalovingfamily.Iwasnotan1butaleaderinschool.Butwhatmademespecialwasnotseenfromtheoutside:Iwas2aboutlife.Mybestqualitywasmypersonality. Atagetwelvemylifehadabreakdown.ItwasthenthatIdevelopedOCD强迫症.Iwasnolongerthe3girl.IfinallytoldmymotherIwassufferingfromdepression.Istartedtakingmedicine4themedicinedidhelp.Butonethingdidn't5:Istillwasoverwhelmedwithdepression.Istillwas6sadandIstartedtobelievethatmylifenolonger7. Thinkingmylifenolongerhad8.Idecidedleavingtheworldwasthesolution.IwroteanotetoallmyfriendsandfamilyexpressingIwas9forleavingthem.AsIwasfoldingthenotemyeyesfellonaphotograph.Itwasalittlegirlwearingacarefreesmile. Ittookmeafewminutesto10whothegirlinthephotowas.I11couldn'tbelievethatsmilingchildwasme!Itseemedmyyoungerselfhadsentmea12.RightthenandthereIknewIcouldn't13myself.OnceIhadbeenastronggirlandIhadtobelikethatagain.IsworeIwouldn'tonly14mymedicine.Iwouldfightthedepressionwithmy15too. It'sbeentwoyears16Irecovered.TherealreasonI'm17isthatIrefusedtoletdepression18mylife.Ilearnedalifelong19:Nevergiveup.Lifeisgood.Everyonehas20inlifebuteveryonecansurvive.Iamlivingproofofthat. 1A.follower B.winner C.listener D.organizer 2A.curious B.upset C.concerned D.enthusiastic 3A.beautiful B.brave C.happy D.casual 4A.Afterall B.Infact C.Inaddition D.Bychance 5A.matter B.occur C.change D.arrive 6A.occasionally B.constantly C.naturally D.rarely 7A.counted B.existed C.turned D.appeared 8A.destination B.advantage C.impact D.meaning 9A.grateful B.sorry C.responsible D.suitable 10A.explain B.assume C.realize D.acknowledge 11A.never B.only C.still D.even 12A.chance B.letter C.greeting D.message 13A.forgive B.kill C.control D.betray 14A.relyon B.takeover C.bringin D.pickout 15A.mind B.choice C.decision D.imagination 16A.after B.since C.before D.when 17A.educated B.praised C.healed D.accepted 18A.break B.define C.fail D.ruin 19A.memory B.story C.lesson D.concept 20A.challenges B.promises C.opportunities D.options
Wearesurroundedbymessagestryingtogetourattention.Advertiserspoliticiansandothergroupsalltrytogetustoagreewiththem.1.Propagandaisnotalwaysabadthingbutitoftenhidesthetruthaboutatopic.It'sverysimilartoadvertisingwhosegoalistogetpeopletobuysomethingwhilepropagandaistochangewhatpeoplebelieve. PropagandaTechniques Tocreatepropagandaacommontechniqueisname﹣calling.Apoliticianmightcallsomeoneatraitororliarwhichmakestheotherpersonlookbad.Anotheristhetrendtechnique.Peoplewanttobeonthesideinthefavor.2.Somepropagandaisbasedonfear.Itscarespeopleintochoosingacertainsideortakingactionwhichmightnotbebad.Anti﹣smokingcampaignsareoneexample.Theymayscarepeopleintothinkingthatiftheysmoketheywillgetcancer. 3Propagandaisusedbymanygroupssuchasbusinessespoliticiansandthegovernment.Itisspreadthroughposterstelevisionandradio.TheInternetmakesiteasytosendmessagestothewholeworld. TypesofPropaganda Politicalpropagandahasbeenaroundaslongastherehavebeenpoliticians.4.Peoplehaveuseditformanyyears.WarpropagandabeganduringWorldWarImorethan100yearsago. Toseeifpropagandaissayingthetruthpeopleneedtodoextrawork.Forexampleadsmightalwayssoundlikethey'retrue.Butbeforeyoubelievethemtrytothinkaboutwhocreatedandpaidforthem.Findoutwhytheydidit.5. A.PropagandaTargets B.PropagandaMediums C.Anotherwordforthisispropaganda D.Somostpeoplewillagreewiththosepoliticians E.Thenyoucandecideifthey'rebeinghonestornot F.Howeverreligiouspropagandawasactuallythefirstofficialone G.Peoplemightjoinsomeonewhoclaimstobepopularorwinning
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:在缺同处加一个漏字符号˄并在其下面写出该加的同. 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11处起不计分. Lastweekourschoo1holdaphotographycompetitionwhatthemewasAnActofKindness.Moststudentsshowedgreatinterestbutparticipatedinitactively.Theyalsoexchangedpracticalexperience.AlltheworksshownthroughtheWeChatplatformandtheywonhighlypraisefromthepublic.Twentyoutstandingphotogotthefirstprizeandwereawardedbytheirschool. Anactivityofferedusanopportunitytosharesomuchkindness.Itraisedourawarenessofhelppeopleinneed.Whenwedoanactofkindnessforsomeonewe'reactuallygettingsomethinginreturnfor一pleasure.
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