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    如图4所示,甲乙两轮用皮带相连,皮带与两轮相切处A′、B′在皮带上,A、B两点在相应的轮子上,假设转动中皮带不打滑,则()http://image.zhihuishu.com/zhs/onlineexam/ueditor/201901/b1cad68e28524e06837c28f58566a5c1.png
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