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如图，矩形ABCD中，AB＝6，AD＝3，E、F分别是CD、AB的中点，将△AED沿折痕AE折起，使点D旋转到D1的位置，使平面AED1与平面ABCE垂直，利用建好的空间直角坐标系，使用空间向量坐标...
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高二上学期数学《》真题及答案
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如图在矩形ABCD中AB=6cm点E.F.分别是边BCAD上一点将矩形ABCD沿EF折叠使点C.D.
如图在四棱锥P.－ABCD中AB∥CDAB⊥ADCD＝2AB平面PAD⊥底面ABCDPA⊥ADE.和
如图在矩形ABCD中AB=4AD=6M.N.分别是ABCD的中点P.是AD上的点且∠PNB=3∠CB
如图在四棱锥P.－ABCD中AB∥CDAB⊥ADCD＝2AB平面PAD⊥平面ABCDPA⊥AD.E.
在矩形ABCD中E.F.G.H.分别为边AB.BC.CD.DA的中点.若AB＝2AD＝4则四边形EF
8
6
4
3
已知等边三角形PAB的边长为2四边形ABCD为矩形AD=4平面PAB⊥平面ABCDEFG分别是线段A
如图在四棱锥P-ABCD中AB∥CDAB⊥ADCD=2AB平面PAD⊥底面ABCDPA⊥ADE.和F
如图1矩形ABCD中AB=6BC=8点E.F.分别是BCCD边上的点且AE⊥EFBE=21求证AE=
如图一张矩形报纸ABCD的长AB=acm宽BC=BcmE.F.分别是ABCD的中点.将这张报纸沿着直
如图所示在四棱锥P.﹣ABCD中底面ABCD是矩形侧棱PA垂直于底面E.F.分别是ABPC的中点PA
如图在矩形ABCD中AB=6cm点E.F.分别是边BCAD上一点将矩形ABCD沿EF折叠使点C.D.
如图在矩形ABCD中M.N.分别是边ADBC的中点E.F.分别是线段BMCM的中点若AB=8AD=1
已知如图在矩形ABCD中E.F.G.H.分别为边AB.BC.CD.DA的中点.若AB＝2AD＝4则图
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6
4
3
如图在矩形ABCD中对角线ACBD相交于点O.点E.F.分别是AOAD的中点若AB=6BC=8则的周
如图在矩形ABCD中点E.F.分别是边ABCD的中点.求证DE＝BF.
如图在梯形ABCD中CD∥ABEF.分别是ADBC的中点且EF＝AB＋CD.求证EF∥AB∥CD.
如图在四棱锥P.－ABCD中AB∥CDAB⊥ADCD＝2AB平面PAD⊥底面ABCDPA⊥AD.E.
如图在矩形ABCD中AB=4AD=6.M.N.分别是ABCD边的中点P.是AD上的点且∠PNB=3∠
已知如图矩形ABCD中E.F.分别是CDAD上的点且BF⊥AE于点M..求证AB﹒DE=AE﹒AM
如图四棱锥P―ABCD中PA⊥ABCD四边形ABCD是矩形.E.F.分别是ABPD的中点.若PA=A
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Agirl1nameDinawasborninCaliforniain1932.After2graduatefromuniversityin1954sheworkedatachildren'shospitalinKentuckyforseveralyears.Howeverherinterestinanimalsinspiredher3takeherfirststeptowardsherfuturework.In1966shewenttoAfricatostudyraremountaingorillas Eventhoughsomeofthegorillaswerequitedangerousthisdidn'tnotdiscourageher.Sheshowedgreat4devotetoherworkandlovedtotellpeopleaboutgorillas.Dinawasanoutgoingandkindpersonandhadtheabilitytogainvaluabledataabouttheirlivesbybecominga5companytothem.Shewroteabookaboutthegorillasshehadlived6Itisthankstoherresearch7wenowknowmoreaboutmountaingorillas.Herloveforthegorillasteachespeopleaboutdangerstheseanimals8facewith.Nowtheyareprotectedbygovernmentsandvariousorganizations.9herworktherewouldbeveryfewmountaingorillaslefttoday.Shehasreceivedworld's10famousaroundtheworldandisnowregardedasoneoftheheroesofthe20thcentury.
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假定你是李华你的英国笔友Mark在中国某大学学习.近日他发email给你说他迷上了中国诗词手头有三本诗词集诗经TheBookofOdes唐诗三百首300TangPoems 宋词三百首300SongLyrics想请你从中给他推荐一本作为起步读本.请你用英语给他回复email要点如下 1.选定推荐书目 2.简单介绍内容 3.说明推荐理由.注意1.词数100左右 2.可以适当增加细节以使行文连贯. HiMark Thankyouforyouremailwhichtellsmethatyou'reconfusedaboutwhichbooktochooseforyourpoemlearning. Bestwishes! Yours LiHua
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Atimelineofairdisasters March112019AnEthiopianAirlinesflightBoeing737fromAddisAbabatoNairobiKenyacrashedsoonaftertakingoffonSundaymorningkillingall157peopleonboardincluding8Chinese. May182018AplanerentedbylocalcompanyCubanadeAviacionfromtheMexicanairlineDamojhcrashedshortlyaftertakingofffromHavana'sJoseMartiInternationalAirport.Atotalof114peoplewereonboardamongwhomtwowomensurvived. November52017aCzech﹣builtLet410belongingtoKhabarovskAviacrashedonlandingat NelkanintheRussianFarEastwiththelossofsixlives.Afour﹣year﹣oldgirlwastheonlysurvivor. May182016EgyptAirFlightMS804CrashesintoMediterraneanSeacausing57deathsincludingonechildandtwobabies. March242015GermanwingsFlight9525with150passengersandcrewcrashedintheFrench AlpsonthewayfromBarcelonatotheGermancityofDuesseldorf.Allonboardwerekilled. March82014MalaysiaAirlinesFlight370disappearedlessthananhouraftertakeoff.TheplanewastravelingfromKualaLumpurInternationalAirporttoBeijing.ItvanishedovertheIndianOceanwith 239passengersandcrewmembersonboard. November172013TatarstanAirlinesBoeing737crashesonlandinginKazanRussiakillingall 50peopleonboard. April202012ABhojaAirBoeing737crashesonitsapproachtothemainairportinthePakistanicapitalIslamabadkillingall121passengersandsixcrew. January92011AnIranAirBoeing727breaksintopiecesnearthecityofOrumiyehkilling72onthesceneandinjuring33fiveofwhomdiedlaterinhospital.Thepilotshadreportedatechnicalfailurebeforetryingtoland. May222010AnAirIndiaExpressBoeing737overshottherunwaywhilelandingatahilltopairportandcrashedintoavalleyburstingintoflamesandleaving159deathsand7injuries. 1Whichyearinthelistwasthesafestyearforairpassengers? A.2017. B.2015. C.2013. D.2011. 2Inthislistwhichofthefollowinginvolvedthemostcrashes? A.Takingoff. B.Landing. C.Boeing737. D.ThemonthofMarch. 3Howmanypeopleescapedfrombeingkilledinthe10airdisasterslistedabove? A.3. B.36. C.38. D.43.
寒暑假期间很多高中学生选择短期出国游学但是也有一部分学生认为这没有意义.请根据以下提示用英语写一篇150词左右的短文并谈谈你自己的看法. 【写作要求】 1.对所给要点逐一陈述适当发挥不要简单翻译 2.作文中不是提及有关考生个人身份的任何信息如校名人名等 3.开关已给出不计入总词数. 4.参考词汇出国游学overseasstudytours 【评分标准】 内容完整语言规范语篇连贯词数适当. Withtheimprovementoflivingstandardsoverseasstudytoursaregainingitspopularitywithsomehighschoolstudents.
Valeriewasveryworriedaboutherdad.Forsometimenowshehadnoticedhewas1hishair.Onedaysheaskedhim'Daddyeverydayyouhavelesshair.2isthat?'Herfathersmiledandsaid'It'sthehairthief.Hevisitsmy3duringthenightwhenI'masleep.Onebyonehepullsoutmyhairandthere'snowayto4him.'ThisworriedValeriebutshewas5tohelpherdad.Thatnightshestayed6aslongasshecould.Whenshewas7herdadandmomhadfallenasleepshetookahammerandwenttotheirbedroomslowlyand8.Shedidn'twantthehairthiefto9her.Whenshearrivedatherfather'ssideshecarefullyinspectedherfather'sheadinordertocatchthehairthiefassoonashe10.Beforelongshesawashadowonherfather'sheadandshe11itwiththehammer.Herfather12aloudcryandgotoutofbedatonce.Heturnedthe13onandtremblingwith14hesawValeriewavingherhammerintheair.'DaddyI15gothim.Butitlookslikehe16!'saidValerie.Meanwhilethemother17.Sheburstinto18whensheknewwhathadhappened.SoValerie'sfatherhadtoexplainthatthehairthiefdidn'texistandthatlosinghairissomethingthatjusthappensnaturallytomostfathers.Valeriestill19aboutherdaddybutshenolongerwaitedforthehairthief.20sheboughtherfatheraverynicesleepinghat.1A.checking B.losing C.touching D.protecting2A.When B.Where C.Why D.What3A.neck B.face C.ears D.head4A.catch B.throw C.hold D.keep5A.excited B.determined C.expected D.allowed6A.awake B.asleep C.afraid D.alone7A.glad B.sorry C.upset D.sure8A.sadly B.nervously C.loudly D.quietly9A.disappoint B.know C.hear D.catch10A.appeared B.left C.returned D.followed11A.caught B.felt C.hit D.covered12A.cameout B.letout C.sentout D.setout13A.radio B.television C.computer D.light14A.shock B.delight C.care D.hope15A.still B.hardly C.nearly D.never16A.stayed B.escaped C.failed D.moved17A.wokeup B.showedup C.lookedout D.turnedaround18A.shouts B.tears C.laughter D.cheers19A.knew B.thought C.wondered D.worried20A.Though B.Instead C.Otherwise D.Besides
Thefutureofourcitythecreativityandinnovationofyoungpeople. A.takesin B.liesin C.resultsin D.bringsin
Theboyaswellashisparentsarefondofplayingcomputergames.
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