题目内容

高频化的意义是什么?为什么提高开关频率可以减小滤波器的体积和重量?为什么提高关频率可以减小变压器的体积和重量?

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软开关电路可以分为哪些几类?其典型拓扑分别是什么样子?各有什么特点?

I am really sorry to say it, but I'm afraid that I _____ make it on time, cause my plane was postponed, could we make it later?

A. cannot
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there is something unexpected _______________, I have to stay to deal with it.

A. happened
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三相桥式PWM逆变电路的结构，是采用双极性调制方法。

A. 对
B. 错