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【单选题】
变频器主电路由整流及滤波电路、( )和制动单元组成。A.
稳压电路
B.
逆变电路
C.
控制电路
D.
放大电路
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举一反三
【简答题】改错题: Ted, a British boy, along with his parents was invite to visit a Chinese calligraphy exhibition in London on last Saturday. They were exciting to have such a good chance to have a close look at t...
【单选题】第二段里,下列哪一个未提到?
A.
set a study program
B.
regulate the time
C.
decide when to go to bed
D.
decide where to eat
【简答题】On a welcoming party, the westerners were eager to know what the organization vice president were talking about when he was giving a speech. They asked an interpreter to translate the speech, soon the...
【简答题】They were giving an acrobatic _________ (perform) for the children.
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