题目内容

从工作原理上看无换向器电动机应属于（）。

A. 直流电动机
B. 笼型异步电动机
C. 同步电动机
D. 绕线型异步电动机

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教育的民族性

怎样理解采样过程中的“时域离散化，频域周期化”。

林少华的《源氏物语》汉译版是目前翻译比较好的版本。

A. 正确
B. 错误

I would be much obliged if you could take the matter up with your Owners or Agents on the damage sustained and also request them to send their representative to us together with yours as soon as possible with a view to ascertaining the extent of the damage. This sentice is most likely appeared in a letter submitted to the（）.

A. captain of a ship
B. port captain
C. agent
D. shipchandler