在TN系统中,保护零线每一处重复接地装置的接地电阻值不应大于多少欧姆?

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问题:

在TN系统中,保护零线每一处重复接地装置的接地电阻值不应大于多少欧姆?

考点:电气安全知识竞赛电气安全知识竞赛题库
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原发性输卵管癌好发于()

A.伞部

B.峡部

C.间质部

D.壶腹部

E.峡部与壶腹交接部

题型:问答题 简答题

竖直上抛物体经8秒钟落地,其速度时间图象如图所示.则抛出点的离地高度______.最高点离地面高度是______.

题型:问答题 简答题

I moved to a new neighborhood two months ago. In the house with a large   16  across the road lived a taxi driver, a single parent with two school-age children. At the end of the day, he would   17  his taxi on the road. I  18  why he did not park it in the garage.
Then, one day I learnt that he had another car in his garage. In the afternoon he would come home  19  work, leave his taxi and go out for his   20 affairs in his other car, not in his taxi. I felt it was    21  .
I was curious to see his personal car but did not make it until I  22 to be outside one evening two weeks  23 , when the garage door was   24 and he drove out in his “own” car: a Rolls-Royce(劳斯莱斯)! It shook me completely   25  I realized what that meant. You see, he was a taxi driver. But  26 inside, he saw himself as something else: a Rolls-Royce owner and a(n)  27 . He drove others in his taxi but himself and his children in his Rolls-Royce. The world looked at his taxi and   28  him a taxi driver. But for him, a taxi was just something he drove for a living. Rolls-Royce was something he drove for a(n)  29 .
We go to bed every night and   30  every morning as parents or children, not as bankers, CEOs or professors. We go for a   31  as close friends or go for a vacation as a   32 . We love life as it is. Yet often, we base our entire happiness and success on how high we  33 the social ladder(阶梯)—how much bigger and better a  34 we have. And we ignore(忽视)our Rolls-Royce, by keeping it dusty in our garage. We should focus more on   35  we are than what we do!
小题1:
A.windowB.garageC.doorD.yard
小题2:
A.park B.stopC.checkD.repair
小题3:
A.knewB.understoodC.askedD.wondered
小题4:
A.forB.out ofC.without D.from
小题5:
A.businessB.nationalC.personalD.public
小题6:
A.wastefulB.meaningfulC.wonderfulD.plentiful
小题7:
A.appearedB.intendedC.expectedD.happened
小题8:
A.later B.moreC.agoD.before
小题9:
A.brokenB.fineC.shutD.open
小题10:
A.once B.beforeC.whenD.until
小题11:
A.farB.deepC.longD.little
小题12:
A.driverB.engineer C.fatherD.son
小题13:
A.calledB.madeC.electedD.turned
小题14:
A.experience B.earningC.lifeD.position
小题15:
A.stay upB.wake up C.stay homeD.go home
小题16:
A.competitionB.performanceC.debateD.party
小题17:
A.familyB.companyC.teamD.whole
小题18:
A.buildB.climbC.standD.lay
小题19:
A.houseB.garageC.carD.taxi
小题20:
A.who B.whatC.whichD.where
题型:问答题 简答题

《说文解字》首创了()

A.笔画编排法

B.部首编排法

C.韵部编排法

D.反切注音法

E.意义编排法

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无分电器点火装置由转速传感器,负荷传感器,电子控制单元,点火线圈,高压线,火花塞组成。

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