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问题 问答题 案例分析题

一台UN=380v、PN=20kw的三相交流电动机，cosα=0．5，要将功率因数提高为0．9，需要多大无功补偿量Qc？

答案

参考答案：

Qc=24.96kvar

句型转换

句型转换。

1. I think they have finished their work. (改为否定句)

    I _____ think they _____ finished their work.

2. Funky Fashion has the worst clothes in town. (改为一般疑问句)

     _____ Funky Fashion _____ the worst clothes in town?

3. Jim runs slowly. Tom runs more slowly. (合并为一句)

    Tom _____ _____ _____ than Jim.

4. This jacket is cheaper than that one. (改为同义句)

    That jacket is _____ than this one.

5. The single room is about 180 yuan a night. (对画线部分提问)

     _____ the _____ of the single room a night?
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单项选择题

银行存款余额调节表，银行对账单应当保存（ ）

A．3年

B．永久

C．5年

D．15年
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