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如图，在四棱锥P﹣ABCD中，底面ABCD为平行四边形，∠ADC＝45°，AD＝AC＝1，O为AC的中点，PO⊥平面ABCD，PO＝2，M为PD的中点 （1）求证：PB∥平面ACM； （2）求证...
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高二上学期数学《》真题及答案
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如图在四棱锥P-ABCD中底面ABCD为平行四边形∠DAB=60°AB=2ADPD⊥底面ABCD求证
如图在平行四边形ABCD中CA⊥AB若AB=5BC=13则S.平行四边形ABCD的值为_______
如图在四边形ABCD中对角线ACBD相交于点O.AE=CF且四边形DEBF是平行四边形.求证四边形A
如图在四边形ABCD中AB//CD若加上AD//BC则四边形ABCD为平行四边形现在请你添加一个适当
如图在底面为平行四边形的四棱锥P.－ABCD中点E.是PD的中点求证PB∥平面AEC.
已知平行四边形ABCD对角线ACBD交于点O.1若AB=BC则平行四边形ABCD是_________
如图在平行四边形ABCD中添加一个条件使平行四边形ABCD是菱形.
如右图所示四棱锥S.－ABCD中底面ABCD为平行四边形侧面SBC⊥底面ABCD已知∠ABC＝45°
已知园边形ABCD中AC与BD交于点O.如果只给出条件AB∥CD那么还不能判定四边形ABCD为平行四
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如图在平行四边形ABCD中BF=DE.求证四边形AFCE是平行四边形.解
如图在四边形ABCD中AB//CD若加上AD//BC则四边形ABCD为平行四边形现在请你添加一个适当
如图四棱锥P.－ABCD中底面ABCD为平行四边形∠DAB＝60°AB＝2ADPD⊥底面ABCD.1
在四边形ABCD中AC与BD相交于点O.如果只给出条件AB∥CD那么还不能判定四边形ABCD为平行四
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如图四棱锥S.－ABCD中底面ABCD为平行四边形E.是SA上一点当点E.满足条件________时
如图四棱锥P.﹣ABCD中底面ABCD为平行四边形∠DAB=60°AB=2ADPD⊥底面ABCD.Ⅰ
已知:如图EF是四边形ABCD的对角线AC上的两点AF=CE连接DEDFBEBF.四边形DEBF为平
在四边形ABCD中AD∥BCAB=CD你认为这样的四边形ABCD是平行四边形吗小强我认为这样的四边形
如图在平行四边形ABCD中DE平分∠ADCAD=6BE=2则平行四边形ABCD的周长是.
如图四棱锥P.－ABCD中底面ABCD为平行四边形∠DAB＝60°AB＝2ADPD⊥底面ABCD.1
如图所示在四边形ABCD中点E.F.是对角线BD上的两点且BE=FD.1若四边形AECF是平行四边形
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onthescenenotgetacrossatatimeaccordingtotelloff chargeoffwhat'smorebesimilartobefluentininotherwords agreewithbetrueof 51.Thephysicsteacherthestudentsseriouslywhowerelateforthelessonthismorning. 52.ThebossgotincrediblyangrywithTomandaskedhimtoleave.hewasfired. 53.Thefoodinthisrestaurantisgoodandthesametheservice. 54.Itdoesn'ttakealongtimeformetogetusedtomyseniorEnglishstudybecausemynewteacher'steachingstylethatofmyjuniorEnglishteacher. 55.StudentswhograduatefromCDFLSaremorelikelytobeadmittedtothefamousAmericanuniversitiesandoneofthereasonsisthatmostofthemspokenEnglish. 56.Thenervousthiefimmediatelyhearingthepolicecar. 57.Femalesheepproduceoneortwolambs. 58.Whattheprofessorsaidtothestudentsandtheystillworeaconfusedlook. 59.Anoldmanwitnessedhowtherobberytookplacesohecalledthepolice. 60.Gasisaveryefficientfuel.Andit'sclean.
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AtthirteenIwasdiagnosedwithkindofattentiondisorder.Itmadeschooldifficultforme.WhenpeopleelseintheclasswasfocusingontasksIcouldnot. InmyfirstliteratureclassMrs.Smithaskedustoreadastoryandthenwriteonitallwithin45minutes.IraisedmyhardrightawayandsaidMrs.SmithyouseethedoctorsaidIhaveattentionproblems.Imightnotbeabletodoit. Sheglanceddownatmethroughherglassesyouarenodifferentfromyourclassmatesyoungman. ItriedbutIdidn'tfinishthereadingwhenthebellrang.Ihadtotakeithome. Inthequietnessofmybedroomthestorysuddenlyallbecamecleartome.ItwasaboutablindpersonLouisBraille.Helivedinatimewhentheblindcouldn'tgetmucheducation.ButLouisdidn'tgiveup.Insteadheinventedareadingsystemofraiseddots点whichopenedupawholenewworldofknowledgetotheblind. Wasn'tItheblindinmyclassbeingmadetolearnlikethesightedstudents?Mythoughtsspilledoutandmypenstartedtodance.Icompletedthetaskwithin40minutes.IndeedIwasnodifferentfromothers;Ijustneededaquieterplace.IfLouiscouldfindhiswayoutofhisproblemswhyshouldIevergiveup? Ididn'texpectanythingwhenIhandledinmypapertoMrs.Smithsoitwasquiteasurprisewhenitcamebacktomethenextday﹣withanAonit.Atthebottomofthepaperwerethesewords:Seewhatyoucandowhenyoukeeptrying? 1Theauthordidn'tfinishthereadinginclassbecause. A.Hewasnewtotheclass B.Hewastriedofliterature C.Hehadanattentiondisorder D.Hewantedtotakethetaskhome 2WhatdoweknowaboutLouisBraillefromthepassage? A.Hehadgoodsight. B.Hemadeagreatinvention. C.Hegaveupreading. D.Helearnedalotfromschool. 3WhatwasMrs.Smith'sattitudetotheauthorattheendofthestory? A.Angry. B.Impatient. C.Sympathetic. D.Encouraging. 4Whatisthemainideaofthepassage? A.Thedisabledshouldbetreatedwithrespect. B.Ateachercanopenupanewworldtostudents. C.Onecanfindhiswayoutofdifficultieswithefforts. D.Everyoneneedsahandwhenfacedwithchallenges.
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USSpaceAgencyReturnstoMarswithInSightLander TheAmericanspaceagency'slanderInSightistoarriveonMarsattheendofNovember2018.UnlikeNASA'sCuriosityroverInSightwillnotmoveacrosstheplanet'ssurface.Insteaditwillbecomethefirstspacecraft航天器usedonlyforexploringunderground.ItwillstudythegeographyofMarssearchingforsignsofMartian火星的quakes. InSightisaprojectofU.S.andEurope.Itis6meterslongand1.5meterswide.Itweighs360kilograms.InSight's1.8﹣meterroboticarmwillputtwoexperimentsinplace.BotharedesignedtoexploreundergroundofMarstolearnabouttheinside. BruceBanerdtistheleadscientistforInSight.Heviewedthespacecraftasarobotthatcantakecareofitself.It'sgotitsownbrain.It'sgotanarm.Itcanlistenandfeelthings.Itpullsitsownpoweroutofthesunhenoted. ThomasZurbuchenoneoftheheadsinNASAsaidtheresultsoftheInSightprojectcouldchangethewaywethinkabouttheinsideofourearth.ButfirstInSightwillhavetolandonMarsundamaged.SinceMarsexplorationstartedinthe1960sonlyabout40percentoftheexplorationshavesucceeded. TomHoffmanisInSight'sprojectmanager.Hesaidearliersuccessesdonotlessentheconcernsforeachnewexploration.Thatwevedoneitbeforedoesn'tmeanwe'renotnervousandexcitedaboutdoingitagainhesaid. InSightwillentertheMartianatmosphere大气层travelingat19800kilometersanhour.ItwillslowforlandingonawideflatareaonMars.IfallgoeswellInSightcouldcarryoutitsexperimentsinabout10weeks.TheInSightprojectisexpectedtocontinueforoneMartianyearabouttwoyearsonEarth. 1WhatisthedifferencebetweenInSightandNASA'sCuriosityrover? A.Thesize. B.Thedesign. C.Thespeed. D.Thetask. 2Whatcanwelearnfromthepassage? A.InSighttravelsatanunchangedspeed. B.InSightistheprojectofAmericaandJapan. C.InSighthasthefunctions功能ofarobot. D.InSightismainlypoweredbythenaturalgas. 3Whatwillbeoneofthecontributions贡献oftheInSightprojectaccordingtoZurbuchen? A.ItwillhelpusunderstandthegeographyofMars. B.Itwillchangethewaywethinkabouttheinsideoftheearth. C.ItwillhelpcarryoutmoreexperimentsonMars. D.ItwillgetmoreinformationaboutthereasonsforMarsquakes. 4WhatisHoffman'sattitudetowardsthisexplorationoftheInSight? A.Confident. B.Satisfied. C.Concerned. D.Frightened.
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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. 81.Therecordingcompanywasveryimpressedwiththeperformancethattheyofferedthebandadeal..
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假定你是李华你的英国朋友Peter来信想了解你的寒假安排情况.请根据以下要点给他回信: 1.学习计划:巩固复习完成作业阅读名著; 2.其它活动:分担家务走亲访友志愿服务. 注意: 1.词数100词左右; 2.可以适当增加细节以使行文连贯; 3.开头已为你写好. DearPeter I'mgladthatyou'reinterestedinmyplanforthecomingwintervacation. Yours LiHua
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