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【单选题】
一对渐开线直齿圆柱齿轮的正确啮合条件是:A.
两轮的模数相等，两轮的压力角相等。
B.
两轮的模数不相等，两轮的压力角相等。
C.
两轮的模数相等，两轮的压力角不相等。
D.
两轮的模数不相等，两轮的压力角不相等。
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