题目内容

Fill in the blanks with the proper conjunctions(用适当的连接词完成句子。)1. I can’t decide _____ dictionary I should buy.2. It suddenly occurred to him ____ he had left his keys in the office.3. _____ struck me most in the movie was the father’s deep love for his son.4. ______ we need is more time.5. _____ one of you breaks the window will have to pay for it.6. ______ and ____they will meet has not been decided yet.7. Please tell me _____you are waiting for.8. Is that _____ you are looking for?9. Would you please tell me _____ the nearest post office is?10. I don’t know _____ he will agree to the plan or not.

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某电感线圈,接入直流电,测出R=12Ω;接入工频交流电,测出阻抗为20Ω,则线圈的感抗为()。

A. 32Ω
B. 20Ω
C. 16Ω
D. 8Ω

电阻元件上的电压、电流的初相一定都是零,所以它们是同相的。()

A. 对
B. 错

在同一交流电压作用下,电感L越大,电感中的电流就越小。()

A. 对
B. 错

端电压超前电流的交流电路一定是电感性电路。()

A. 对
B. 错

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