求解动滑轮的省力原理(用图解释!)
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![求解动滑轮的省力原理(用图解释!)](/uploads/image/z/4650776-8-6.jpg?t=%E6%B1%82%E8%A7%A3%E5%8A%A8%E6%BB%91%E8%BD%AE%E7%9A%84%E7%9C%81%E5%8A%9B%E5%8E%9F%E7%90%86%EF%BC%88%E7%94%A8%E5%9B%BE%E8%A7%A3%E9%87%8A%21%EF%BC%89)
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