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【多选题】
渐开线齿轮啮合传动的一大优点是( )四线合一。只要齿轮传递的力矩恒定,则轮齿间的压力大小及方向就不会改变,能够保障齿轮传动的平稳性。
A.
啮合线
B.
公法线
C.
两基圆的内公切线
D.
正压力的作用线
E.
两节圆的内公切线
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