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【单选题】
产生自激振动的主要原因是（）。A.
转动的机床零件
B.
机床附近的振动源
C.
在加工过程中切削力的变化
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反馈参考答案：
举一反三
【简答题】按照产生的机理来划分,噪声可以分为:
【简答题】I mean, it’ll be ________ if you and I just push it a ________ with our hands.
【单选题】听力原文：W: Our teacher encourages us to watch the news in English on TV. She says it is a good way to learn a language. M: I think so. It’ll be especially helpful if you can check the same story in the n...
A.
Watching TV is better than reading a newspaper.
B.
The newspaper may give more information.
C.
TV is more interesting than a newspaper.
D.
A combination of reading and listening is more effective.
【简答题】Complete the following sentences with what you hear on the tape. 1) That morning Carl came round a _______ and saw a dark green _______ in the middle of the road. 2) Carl stopped but didn’t get ______...
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