如图甲、乙两带电小球的质量均为m,所带电量分别为q和-q,两球间用绝缘细线连接,

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问题:

如图甲、乙两带电小球的质量均为m,所带电量分别为q和-q,两球间用绝缘细线连接,甲球用绝缘细线悬挂在天花扳上。在两球所在空间有方向向左的匀强电场,电场强度为E.当两球平衡时细线被拉紧,此时的情景应该是(   )

考点:共点力的平衡
题型:选择题

已知三角形的三边长分别为30cm、40cm、50cm,则此三角形的面积为______.

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在变配电安装工程中,下述哪种设备属于高压电器()。

A.盘上高压母线

B.硅整流柜

C.高压隔离开关

D.高压负荷开关

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The first day at school has left a deep ___ on me.I'll never forget it.
As soon as I rushed into the classroom,the bell rang.A young beautiful woman came in,but she was ____,no smile on her face.“You are not permitted to ____ me in the course of class unless...”She was speaking when I heard a____“Lily,Lily”from outside the door.My grandmother was standing there with a pair of socks in her hand.I didn't realize I was bare feet____ then.I wanted to ____ them.but I dared not do that.I shook my hand,____“Don't wait here any longer.Leave quickly.”As I did so,I still ____my eyes on my teacher.I really didn't want her to take ____ of me,but she did.She went out to get the socks.When she gave them to me,she looked at me for a while.My face suddenly turned ____ and my heart ____ faster.I began to put the socks on.Unfortunately I was so nervous that my ____ hands couldn't get them onto my feet easily.Just then I heard my name called.I ____ from my seat quickly.“Can you ____the numbers from one to one hundred?” the teacher asked.I nodded. ____her surprise,I did very well.Finally she said,“Be ___, please.Study hard.”I looked ____ her to find a smile on her face.I felt ____ at last.
The first day at school has stayed in my ____ as something embarrassing(尴尬)but ___.
小题1:
A.memoryB.impressionC.imaginationD.feeling
小题2:
A.modernB.humorousC.gentleD.serious
小题3:
A.troubleB.questionC.interruptD.excuse
小题4:
A.voiceB.soundC.noiseD.word
小题5:
A.beforeB.afterC.justD.until
小题6:
A.getB.throwC.acceptD.wear
小题7:
A.sayingB.meaningC.cryingD.shouting
小题8:
A.fixed B.laidC.openedD.shut
小题9:
A.careB.interestC.attentionD.notice
小题10:
A.paleB.whiteC.redD.black
小题11:
A.beatB.jumpedC.struckD.felt
小题12:
A.smallB.dirtyC.shakingD.own
小题13:
A.roseB.raisedC.stand upD.jumped
小题14:
A.addB.countC.recognizeD.write
小题15:
A.WithB.ForC.ToD.Great to
小题16:
A.carefulB.sittingC.quietD.seated
小题17:
A.up atB.overC.aroundD.through
小题18:
A.sorryB.relaxedC.disappointedD.puzzled
小题19:
A.bodyB.classroomC.memoryD.heart
小题20:
A.strangeB.sweetC.badD.terrible
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卷烟名称设计遵循的基本原则:首先,要(),其次,要能促使情感的诱发;再次要();最后,卷烟命名不可忽视文化差异,尊重一些民族文化和习俗习惯。

题型:选择题

草坪播种施工的优点是______。

A.施工投资小

B.劳力省

C.生命力强

D.杂草不易侵入

E.养护要求粗放

F.形成草坪快

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