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【单选题】
50HZ以下的调速叫什么?A.
恒功率调速
B.
恒转矩调速
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反馈参考答案：
举一反三
【单选题】听力原文：M: It's hard to believe John has already finished his homework. W: Well, he copied Jack's homework and made a few changes. Q: What does the woman say about John? (17)
A.
John is a fast worker.
B.
John did Jack' s homework.
C.
John has not finished his homework.
D.
John didn't do the homework on his own.
【简答题】比较原生质体，球状体，L型细菌和支原体的异同。
【简答题】After he finished his duties on the farm, John often occupies himself by fishing.
【简答题】John Smith was lazy. He had finished his education and was happy to sit in his room and listen to the radio all day long. In fact, he had been doing nothing for almost six months, which worried his fa...
【单选题】--- Has John finished writing his compostion?--- No, and it______ two hours ago.
A.
should be finished
B.
should have finished
C.
should finish
D.
should have been finished
【单选题】“Has John finished writing his composition?” “No, and it ____two hours ago.”
A.
should be finished
B.
should have finished
C.
should finished
D.
should have been finished
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