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【单选题】
链传动张紧的目的是A.
使链条产生初拉力,以使链传动能传递运动和功
B.
使链条与轮齿之间产生摩擦力,以使链传动能传递运动和功
C.
避免链条垂度过大时产生啮合不良
D.
避免打滑
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A.
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