题目内容

逆变部分通过对功率管的通断控制,将直流转变为幅值、频率可变的交流。

A. 对
B. 错

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简述由整流、中间电路与逆变三部分组成的逆变系统中中间电路的作用有哪些?

When you have finished eating, refold your napkin to the way it was before and put it next to your plate. (

A. 对
B. 错

You should stand up to get the salt if it is out of your reach. ( )

A. 对
B. 错

Your bread and butter plate is located towards the left of animaginaryline across your service plate. ( )

A. 对
B. 错

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