什么叫电枢反应?

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问题:

什么叫电枢反应?

考点:检修与运行技术电气专业电气专业题库
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A Policeman and a Thief  

One day a policeman was taking a thief to the city . On the way , they saw a shop . The thief said . “ Let me go into the shop to buy some bread . We can eat it in the train . ”

The policeman agreed . The thief went into the shop and ran out of the back door . When the policeman knew that , he began to look for the thief everywhere . At last the policeman caught(抓获) thief again . They went on to the city . On the way they came to the same shop . The thief wanted to buy some bread again . “Oh , no . ” said the policeman , “You did that before , and you ran away . This time Ill go into the shop and buy bread . You must wait here for me . ”

小题1:What was the policeman doing one day ?

A.Catching a thief with others .

B.Doing nothing.

C.Taking a thief to the city .

D.Walking go the city by himself .小题2:On the way the thief asked to         .

A.buy some food to eat .

B.let him free .

C.take a rest .

D.walk slowly .小题3:When the thief went into the shop , he ran out of        .

A.the back door .

B.the back window .

C.the front door .

D.the front window .小题4:When the thief ran away the first time , what did the policeman do ?

A.The policeman caught the thief again .

B.The policeman looked for the thief . but he didn,t find him .

C.The thief was caught again by other policemen .

D.The policeman went back without(没有) the thief .小题5: From the last three sentences, we know that the policeman was very        .     

A.brave

B.careful

C.clever

D.foolish

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看图,选择正确的句子。

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( ) 2. B. Hang up your dress.      
( ) 3. C. Wash you shirt.  
( ) 4. D. Put on your T-shirt.                                                                               
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B.进口关税和进口消费税

C.运抵境内输入地点前的运保费

D.运抵境内输入地点后的运保费

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如图是CsCl晶体的晶胞结构(晶体中最小重复单元),已知晶体中两个最近的Cs核间距离为a cm,氯化铯的式量为M,NA为阿伏加德罗常数,则氯化铯晶体的密度为(  )。

A.g·cm-3

B.g·cm-3

C.g·cm-3

D.g·cm-3

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有一种恒定的EPR推力关系,只要满足:()

A.大气压力和大气温度是恒定的

B.大气温度和Ps4是恒定的

C.大气温度和喷气喷嘴面积是恒定的

D.大气压力和喷气喷嘴面积是恒定的

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