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关于E.的百科

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...
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、...
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 ...
 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...
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...
  IstillremembermyfirstdayatschoolinLondonandIwashalf-e...
  •   IstillremembermyfirstdayatschoolinLondonandIwashalf-e...

  • 问题详情:  IstillremembermyfirstdayatschoolinLondonandIwashalf-excitedandhalf-frightened.OnmywaytoschoolIwonderedwhatsortofquestionstheotherboyswouldaskmeandpracticedalltheanswers:“Iamnineyearsold.IwasbornherebutIhaven’tlivedheresinceIwastwo.Iwasl...
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设U={a,b,c,d,e},A={b,c,d},B={b,e},则等于A.{e}           B.{...
 E-mail,aswellastelephones,
  •  E-mail,aswellastelephones,

  • 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:选择题...
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Peopleinfloodedareassufferedalot,withoutdrinkingwater,e...
  • Peopleinfloodedareassufferedalot,withoutdrinkingwater,e...

  • 问题详情:Peopleinfloodedareassufferedalot,withoutdrinkingwater,electricityand________foodsupply,sotheycontinuedtofleethetown.A.suitable                           B.contentC.handy                       ...
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Recently,e-booksalesarefallingwhilesalesofpaperbooksare...
  • Recently,e-booksalesarefallingwhilesalesofpaperbooksare...

  • 问题详情:Recently,e-booksalesarefallingwhilesalesofpaperbooksaregrowing—anditismainlybecauseoftheyoungerpeople.Morethan360millionbooksweresoldintheUKin2016—a2%jumpinayearthatsawUKbuyersspendanextra6%onbooksinprintande-bookformats,accordingtofindings...
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E-mail,aswellastelephones,
  • E-mail,aswellastelephones,

  • 问题详情:E-mail,aswellastelephones,________animportantpartindailycommunication.A.isplaying         B.haveplayed        C.areplaying      D.play【回答】A知识点:现在进行时及其被动式题型:选择题...
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与130°E相对的经线是:(   )A.50°E         B.130°W       C.230°E...
 E-mailEnglish
  •  E-mailEnglish

  • 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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已知f(x)=ex-e-x,g(x)=ex+e-x(e=2.71828…)(1)求[f(x)]2-[g(x)]...
  • 已知f(x)=ex-e-x,g(x)=ex+e-x(e=2.71828…)(1)求[f(x)]2-[g(x)]...

  • 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-x)(ey-e-y)=ex+y+e-x-y-ex-y-e-x+y=[ex+y+e-(x+y)]-[ex-y+e-(x-y)]=g(x+y)-g(x-y)∴g(x+y)-g(x-y)=4        ...
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函数y=(ex+e-x)的导数是(  )A.(ex-e-x)                     B.(e...
—Howdoyouspellyourname,please?—            A.P-E-T-E-R,...
    Managingyourtimewellisanimportantelementofsuccess—e...
  •     Managingyourtimewellisanimportantelementofsuccess—e...

  • 问题详情:    Managingyourtimewellisanimportantelementofsuccess—especiallyifyou’reastudent.Ifyousetprioritiesthatfityourneedsandlifestyle,you'llhaveabetterchanceofachievingyourgoals.    Herearesometipsfortakingcontrolofyourtimeandorganizingy...
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 Withthedevelopmentofmodernsociety,E-mailaswellasteleph...
  •  Withthedevelopmentofmodernsociety,E-mailaswellasteleph...

  • 问题详情: Withthedevelopmentofmodernsociety,E-mailaswellastelephones        ________animportantpartindailycommunication. A.haveplayed    B.isplaying     C.areplaying  D.played【回答】B知识点:主谓一致题型:选择题...
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---HowdoyouliketheconcertgivenbyF.L.R.?            ---E...
  • ---HowdoyouliketheconcertgivenbyF.L.R.?            ---E...

  • 问题详情:---HowdoyouliketheconcertgivenbyF.L.R.?            ---Exciting,______onepieceofthemusicwasn’tplayedquitewell.        A.though        B.because        C.so            D.and【回答】A知识点:连词题...
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LiuYiting       manyotherstudentswhostudyabroad       E...
 E-mails,though
  •  E-mails,though

  • 问题详情: E-mails,though_________exposedtomisleadinginformation,areconsideredfarmoreconvenientthantraditionalletters.A.occasionallyB.especiallyC.originallyD.naturally【回答】A知识点:副词题型:选择题...
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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...
  • 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...

  • 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′(e)=2,∴y=f(x)在(e,f(e))处的切线方程为y=2(x-e)+e,即y=2x-e.(2)∵f′(x)=lnx+1,令f′(x)=0,得x=,当x∈...
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 *地(0°,90°E)、乙地(60°N,90°E)、*地(0°,40°E)、丁地(60°S,40°E)距本初...
 Withmoreforestsdestroyed,hugequantitiesofgoodearth   e...
  •  Withmoreforestsdestroyed,hugequantitiesofgoodearth   e...

  • 问题详情: Withmoreforestsdestroyed,hugequantitiesofgoodearth   eachyear. A.iswashingaway       B.isbeingwashedaway C.arewashingaway      D.arebeingwashedaway【回答】D知识点:现在进行时及其被动式题型:选择题...
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E-mailsystemsatthousandsofcompaniesandgovernmentoffices...
  • E-mailsystemsatthousandsofcompaniesandgovernmentoffices...

  • 问题详情:E-mailsystemsatthousandsofcompaniesandgovernmentofficesaroundtheworldwereattackedbyavirus(病毒)called“Melissa”thatdisguises(伪装)itselfasan“importantmessage”fromafriend.Inspiteofaweekendofwarnings,morethan50000computersatabout100placesarou...
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