题目内容

Nadya Suleman had twins and octuplets.

A. 对
B. 错

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The One-Child Poliy was the idea of the people living in towns.

A. 对
B. 错

One-Child Policy holds that children learn to play happily and live together better infamilies with more than one child.

A. 对
B. 错

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?

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?

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