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问题 单项选择题

离心泵倒转的原因是（）。

A、电源正负极接反

B、电源的相位排序错误

C、电源的电压等级错误

D、电机线圈绕组不对

答案

参考答案：B

补全对话，情景问答
选择方框中的句子完成对话。
A. I have to listen to the radio to know 
   what is happening in the world.
B. So do I.
C. Either you turn them off or you have to put up with them. D. It is the same with TV.
E. I read newspapers and watch TV every evening.
A: What do you do in the evening, Bill?
B:  1 
A: Which programs do you like best on TV?
B: News and sports. How about you, Claire?
A: Unfortunately I don't have TV sets,  2  I also read newspapers.
B: Do you read everything in the newspaper?
A: No. I hate the advertisements in it.
B:  3  
A: There are also too many advertisements on the radios.
B:  4  You needn't read the advertisements in the newspaper, but you can't avoid them with TV and the radio.
A:  5
B: You are right.
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多项选择题

既可用于转账，又可用于支取现金的票据有( )。

A．银行本票

B．银行汇票

C．商业汇票

D．普通支票
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