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【单选题】
带传动在工作中打滑的原因是______。A.
带的弹性较大
B.
带和带轮的摩擦系数较小
C.
传递的外载荷超过带与带轮间的极限摩擦力
D.
带的中心距过大
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【单选题】John and I have just been telling stories two of us.
A.
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B.
to each other
C.
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D.
both
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