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【简答题】
齿轮强度计算是根据齿轮可能出现的失效形式来进行的。在一般齿轮传动中,轮齿的失效主要是 和 。
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【单选题】—Are those CDs on the sofa? — [ ]
A.
No, they aren't.
B.
No, it isn't.
C.
Yes, those are.
D.
Yes, it is.
【简答题】What does the cash register look like for those unused to all the different colors and names?
【简答题】What does the cash register look like for those unused to all the different colors and names? It looks a little bit like __________________________ .
【单选题】选择填空。 — Are those your tennis rackets? — No, ______. [ ]
A.
it isn't
B.
they are
C.
those aren't
D.
they aren't
【简答题】当人体的某一部位碰到相线或绝缘性能不好的电气设备外壳时,电流由相线经人体流人大地导致的触电现象称为 。
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