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发表于:2020-10-12
问题详情:某地为了城市发展,在现有的四个城市A、B、C、D附近新建机场E.试建立适当的直角坐标系,写出点A、B、C、D、E的坐标.【回答】以A点作为坐标原点,经过A点的水平线作为x轴,经过A的竖直线...
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发表于:2019-12-15
问题详情:在化学实验时必须注意安全*作,避免意外伤害,下列实验*作或事故处理中不正确的是( )E. 在点燃易燃气体前,必须检验气体的纯度F. 在稀释浓硫*时,应将浓硫*用玻璃棒引流慢慢注入水中G....
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发表于:2019-05-17
问题详情: 2015年4月25日14时11分,某国发生了8.1级地震,震中位于28.2°N、84.7°E.据此完成1﹣2题.1.下面四幅图能正确表示本次地震震中位置的是()A.① B....
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发表于:2023-02-27
问题详情:现给定以下器材:A.闪光照相机B.秒表C.打点计时器 D.交流电源4~6V E.导线若干 F.纸带G.复写纸 H.铁架台I.游标卡尺 J.重物 K.刻度尺 L.直径1cm的钢球 M.1m长细线 N.照相底片设计一个测...
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发表于:2021-10-27
问题详情:一绝缘光滑半圆环轨道放在竖直向下的匀强电场中,场强为E.在与环心等高处放有一质量为m、带电+q的小球,由静止开始沿轨道运动,下述说法正确的是()A.小球经过环的最低点时速度最大B.小球...
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发表于:2019-12-23
问题详情:函数y=(ex+e-x)的导数是()A.(ex-e-x) B.(ex+e-x)C.ex-e-x D.ex+e-x【回答】A[y′=(ex+e-x)′=(ex-e...
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发表于:2020-02-01
问题详情:Recently,e-booksalesarefallingwhilesalesofpaperbooksaregrowing—anditismainlybecauseoftheyoungerpeople.Morethan360millionbooksweresoldintheUKin2016—a2%jumpinayea...
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发表于:2020-12-02
问题详情:与130°E相对的经线是:( )A.50°E B.130°W C.230°E D.50°W【回答】 D知识点:地球和地球仪题型:选择题...
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发表于:2020-05-13
问题详情: Managingyourtimewellisanimportantelementofsuccess—especiallyifyou’reastudent.Ifyousetprioritiesthatfityourneedsandlifestyle,you'llhaveabetterchanceofac...
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发表于:2021-10-13
问题详情:LiuYiting manyotherstudentswhostudyabroad English nativespeakers.A.asgoodas,speak,asgoodas B.aswellas,speaks,asg...
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发表于:2020-02-25
问题详情: *地(0°,90°E)、乙地(60°N,90°E)、*地(0°,40°E)、丁地(60°S,40°E)距本初子午线的距离由大到小的排列是 A.丁*乙* B.*乙*丁 C.**丁乙 D.*丁*...
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发表于:2021-05-30
问题详情:E-mail,aswellastelephones,________animportantpartindailycommunication.A.isplaying B.haveplayed C.areplaying D.play【回答】A...
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发表于:2020-11-18
问题详情:设U={a,b,c,d,e},A={b,c,d},B={b,e},则等于A.{e} B.{a,b,e} C.{a,b,c,d,e} D.【回答】B知识点:*与函数的概念题型:选择题...
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发表于:2021-05-27
问题详情: E-mailEnglish_____usestwotypesofwords. A.mainly B.strongly C.gradually【回答】A知识点:副词题型:选择题...
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发表于:2019-02-23
问题详情: E-mails,though_________exposedtomisleadinginformation,areconsideredfarmoreconvenientthantraditionalletters.A.occasionallyB.especiallyC.originallyD.naturally【回...
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发表于:2019-05-25
问题详情:已知函数f(x)=x·lnx(e为无理数,e≈2.718).(1)求函数f(x)在点(e,f(e))处的切线方程;(2)设实数a>,求函数f(x)在[a,2a]上的最小值.【回答】 (1)∵f(x)=x·lnx,∴x>0,f′(x)=lnx+1,∵f(e)=e,f′...
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发表于:2021-03-15
问题详情:—Howdoyouspellyourname,please?— A.P-E-T-E-R,Peter. B.ThisisPeter.C.I'mPeter. D.YoucancallmePeter....
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发表于:2020-04-28
问题详情: IstillremembermyfirstdayatschoolinLondonandIwashalf-excitedandhalf-frightened.OnmywaytoschoolIwonderedwhatsortofquestionstheotherboyswouldaskmeandpracticedall...
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发表于:2021-03-31
问题详情: E-mail,aswellastelephones,____ animportantpartindailycommunication.A.isplaying B.haveplayed C.areplaying D.play 【回答】A知识点:主谓一致题型:选...
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发表于:2021-04-07
问题详情: Withthedevelopmentofmodernsociety,E-mailaswellastelephones ________animportantpartindailycommunication. A.haveplayed B.isplaying ...
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发表于:2022-08-08
问题详情: Withmoreforestsdestroyed,hugequantitiesofgoodearth eachyear. A.iswashingaway B.isbeingwashedaway C.arewashingaway D.arebeingwashe...
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发表于:2021-11-04
问题详情:---HowdoyouliketheconcertgivenbyF.L.R.? ---Exciting,______onepieceofthemusicwasn’tplayedquitewell. A.though ...
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发表于:2021-07-17
问题详情:已知f(x)=ex-e-x,g(x)=ex+e-x(e=2.71828…)(1)求[f(x)]2-[g(x)]2的值;(2)若f(x)f(y)=4,g(x)g(y)=8,求的值.【回答】解析(1)[f(x)]2-[g(x)]2=(ex-e-x)2-(ex+e-x)2=(e2x-2+e-2x)-(e2x+2+e-2x)=-4.(2)f(x)f(y)=(ex-e...
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发表于:2021-12-16
问题详情:E-mailsystemsatthousandsofcompaniesandgovernmentofficesaroundtheworldwereattackedbyavirus(病毒)called“Melissa”thatdisguises(伪装)itselfasan“importantmessage”f...
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发表于:2020-11-12
问题详情:Peopleinfloodedareassufferedalot,withoutdrinkingwater,electricityand________foodsupply,sotheycontinuedtofleethetown.A.suitable ...