E.的精選

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一絕緣光滑半圓環軌道放在豎直向下的勻強電場中,場強為E.在與環心等高處放有一質量為m、帶電+q的小球,由靜止開...

一絕緣光滑半圓環軌道放在豎直向下的勻強電場中,場強為E.在與環心等高處放有一質量為m、帶電+q的小球,由靜止開...

2021-10-27
問題詳情:一絕緣光滑半圓環軌道放在豎直向下的勻強電場中,場強為E.在與環心等高處放有一質量為m、帶電+q的小球,由靜止開始沿軌道運動,下述說法正確的是()A.小球經過環的最低點時速度最大B.小球在運動過程中機械能守恆C.小球經...
現給定以下器材:A.閃光照相機B.秒錶C.打點計時器 D.交流電源4~6V E.導線若干 F.紙帶G.複寫紙 ...

現給定以下器材:A.閃光照相機B.秒錶C.打點計時器 D.交流電源4~6V E.導線若干 F.紙帶G.複寫紙 ...

2023-02-27
問題詳情:現給定以下器材:A.閃光照相機B.秒錶C.打點計時器 D.交流電源4~6V E.導線若干 F.紙帶G.複寫紙 H.鐵架臺I.遊標卡尺 J.重物 K.刻度尺 L.直徑1cm的鋼球 M.1m長細線 N.照相底片設計一個測當地重力加速度g的實驗方案:  (1...
某地為了城市發展,在現有的四個城市A、B、C、D附近新建機場E.試建立適當的直角座標系,寫出點A、B、C、D、...

某地為了城市發展,在現有的四個城市A、B、C、D附近新建機場E.試建立適當的直角座標系,寫出點A、B、C、D、...

2020-10-12
問題詳情:某地為了城市發展,在現有的四個城市A、B、C、D附近新建機場E.試建立適當的直角座標系,寫出點A、B、C、D、E的座標.【回答】以A點作為座標原點,經過A點的水平線作為x軸,經過A的豎直線作為y軸,每個小方格的邊長作為單...
在化學實驗時必須注意安全*作,避免意外傷害,下列實驗*作或事故處理中不正確的是( )E. 在點燃易燃氣體前,必...

在化學實驗時必須注意安全*作,避免意外傷害,下列實驗*作或事故處理中不正確的是( )E. 在點燃易燃氣體前,必...

2019-12-15
問題詳情:在化學實驗時必須注意安全*作,避免意外傷害,下列實驗*作或事故處理中不正確的是( )E. 在點燃易燃氣體前,必須檢驗氣體的純度F. 在稀釋濃硫*時,應將濃硫*用玻璃棒引流慢慢注入水中G. 濃硫*有腐蝕*,沾到面板上,應用較...
 2015年4月25日14時11分,某國發生了8.1級地震,震中位於28.2°N、84.7°E.據此完成1﹣2...

 2015年4月25日14時11分,某國發生了8.1級地震,震中位於28.2°N、84.7°E.據此完成1﹣2...

2019-05-17
問題詳情: 2015年4月25日14時11分,某國發生了8.1級地震,震中位於28.2°N、84.7°E.據此完成1﹣2題.1.下面四幅圖能正確表示本次地震震中位置的是()A.①                   B.②              ...
E-mail,aswellastelephones,

E-mail,aswellastelephones,

2021-05-30
問題詳情:E-mail,aswellastelephones,________animportantpartindailycommunication.A.isplaying         B.haveplayed        C.areplaying      D.play【回答】A知識點:現在進行時及其被動式題型...
—Howdoyouspellyourname,please?—            A.P-E-T-E-R,...

—Howdoyouspellyourname,please?—            A.P-E-T-E-R,...

2021-03-15
問題詳情:—Howdoyouspellyourname,please?—            A.P-E-T-E-R,Peter.     B.ThisisPeter.C.I'mPeter.                 D.YoucancallmePeter.【回答】A知識點:口語應用題型:選擇...
  IstillremembermyfirstdayatschoolinLondonandIwashalf-e...

  IstillremembermyfirstdayatschoolinLondonandIwashalf-e...

2020-04-28
問題詳情:  IstillremembermyfirstdayatschoolinLondonandIwashalf-excitedandhalf-frightened.OnmywaytoschoolIwonderedwhatsortofquestionstheotherboyswouldaskmeandpracticedalltheanswers:“Iamnineyearsold.I...
 E-mailEnglish

 E-mailEnglish

2021-05-27
問題詳情: E-mailEnglish_____usestwotypesofwords.  A.mainly        B.strongly         C.gradually【回答】A知識點:副詞題型:選擇題...
函式y=(ex+e-x)的導數是(  )A.(ex-e-x)                     B.(e...

函式y=(ex+e-x)的導數是(  )A.(ex-e-x)                     B.(e...

2019-12-23
問題詳情:函式y=(ex+e-x)的導數是()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-x).]知識點:圓錐曲線與方程題型:選...
 *地(0°,90°E)、乙地(60°N,90°E)、*地(0°,40°E)、丁地(60°S,40°E)距本初...

 *地(0°,90°E)、乙地(60°N,90°E)、*地(0°,40°E)、丁地(60°S,40°E)距本初...

2020-02-25
問題詳情: *地(0°,90°E)、乙地(60°N,90°E)、*地(0°,40°E)、丁地(60°S,40°E)距本初子午線的距離由大到小的排列是 A.丁*乙*     B.*乙*丁      C.**丁乙        D.*丁*乙【回答】B知識點:地球與地圖單...
與130°E相對的經線是:(   )A.50°E         B.130°W       C.230°E...

與130°E相對的經線是:(   )A.50°E         B.130°W       C.230°E...

2020-12-02
問題詳情:與130°E相對的經線是:(   )A.50°E         B.130°W       C.230°E        D.50°W【回答】      D知識點:地球和地球儀題型:選擇題...
Peopleinfloodedareassufferedalot,withoutdrinkingwater,e...

Peopleinfloodedareassufferedalot,withoutdrinkingwater,e...

2020-11-12
問題詳情:Peopleinfloodedareassufferedalot,withoutdrinkingwater,electricityand________foodsupply,sotheycontinuedtofleethetown.A.suitable                           B.contentC.h...
 E-mails,though

 E-mails,though

2019-02-23
問題詳情: E-mails,though_________exposedtomisleadinginformation,areconsideredfarmoreconvenientthantraditionalletters.A.occasionallyB.especiallyC.originallyD.naturally【回答】A知識點:副詞題型:選擇題...
LiuYiting       manyotherstudentswhostudyabroad       E...

LiuYiting       manyotherstudentswhostudyabroad       E...

2021-10-13
問題詳情:LiuYiting       manyotherstudentswhostudyabroad       English         nativespeakers.A.asgoodas,speak,asgoodas    B.aswellas,speaks,asgoodasC.aswellas,speaks,aswella...
已知函式f(x)=x·lnx(e為無理數,e≈2.718).(1)求函式f(x)在點(e,f(e))處的切線方...

已知函式f(x)=x·lnx(e為無理數,e≈2.718).(1)求函式f(x)在點(e,f(e))處的切線方...

2019-05-25
問題詳情:已知函式f(x)=x·lnx(e為無理數,e≈2.718).(1)求函式f(x)在點(e,f(e))處的切線方程;(2)設實數a>,求函式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))處的切線方...
 Withthedevelopmentofmodernsociety,E-mailaswellasteleph...

 Withthedevelopmentofmodernsociety,E-mailaswellasteleph...

2021-04-07
問題詳情: Withthedevelopmentofmodernsociety,E-mailaswellastelephones        ________animportantpartindailycommunication. A.haveplayed    B.isplaying     C.areplaying  D.played【回...
Recently,e-booksalesarefallingwhilesalesofpaperbooksare...

Recently,e-booksalesarefallingwhilesalesofpaperbooksare...

2020-02-01
問題詳情:Recently,e-booksalesarefallingwhilesalesofpaperbooksaregrowing—anditismainlybecauseoftheyoungerpeople.Morethan360millionbooksweresoldintheUKin2016—a2%jumpinayearthatsawUKbuyersspendanextra6%...
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)]...

2021-07-17
問題詳情: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)]...
 Withmoreforestsdestroyed,hugequantitiesofgoodearth   e...

 Withmoreforestsdestroyed,hugequantitiesofgoodearth   e...

2022-08-08
問題詳情: Withmoreforestsdestroyed,hugequantitiesofgoodearth   eachyear. A.iswashingaway       B.isbeingwashedaway C.arewashingaway      D.arebeingwashedaway【回答】D知識點:現在進行時...
---HowdoyouliketheconcertgivenbyF.L.R.?            ---E...

---HowdoyouliketheconcertgivenbyF.L.R.?            ---E...

2021-11-04
問題詳情:---HowdoyouliketheconcertgivenbyF.L.R.?            ---Exciting,______onepieceofthemusicwasn’tplayedquitewell.        A.though        B.because        C.so...
E-mailsystemsatthousandsofcompaniesandgovernmentoffices...

E-mailsystemsatthousandsofcompaniesandgovernmentoffices...

2021-12-16
問題詳情:E-mailsystemsatthousandsofcompaniesandgovernmentofficesaroundtheworldwereattackedbyavirus(病毒)called“Melissa”thatdisguises(偽裝)itselfasan“importantmessage”fromafriend.Inspiteofaweekendof...
    Managingyourtimewellisanimportantelementofsuccess—e...

    Managingyourtimewellisanimportantelementofsuccess—e...

2020-05-13
問題詳情:    Managingyourtimewellisanimportantelementofsuccess—especiallyifyou’reastudent.Ifyousetprioritiesthatfityourneedsandlifestyle,you'llhaveabetterchanceofachievingyourgoals.    Herea...
設U={a,b,c,d,e},A={b,c,d},B={b,e},則等於A.{e}           B.{...

設U={a,b,c,d,e},A={b,c,d},B={b,e},則等於A.{e}           B.{...

2020-11-18
問題詳情:設U={a,b,c,d,e},A={b,c,d},B={b,e},則等於A.{e}           B.{a,b,e}        C.{a,b,c,d,e}    D.【回答】B知識點:*與函式的概念題型:選擇題...
 E-mail,aswellastelephones,

 E-mail,aswellastelephones,

2021-03-31
問題詳情: E-mail,aswellastelephones,____  animportantpartindailycommunication.A.isplaying   B.haveplayed   C.areplaying   D.play 【回答】A知識點:主謂一致題型:選擇題...