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【单选题】
(2011 年高考题)一对齿轮要正确啮合,必须相等的是( )A.
分度圆直径
B.
宽度
C.
齿数
D.
模数
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【单选题】听力原文：W: Jack sent you a present yesterday. M: I got one from John, but not from Jack. Who did the man get a present from?
A.
The woman.
B.
Jack.
C.
John.
D.
The man.
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