皮皮学，免费搜题
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【单选题】
一对渐开线齿轮传动( )
A.
平均传动比恒定不变
B.
传动比与中心距有关
C.
标准中心距的条件下,分度圆与节圆重合
D.
在非标准中心距的条件下,啮合角等于齿形角
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