分别用定�轮动�轮�轮组把同一个物体匀速提升到同一高度其中机械效率最高的是a.定�轮b.动�轮c.�轮组d.无法确定 题目和参考答案 Template




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tomski分别用定�轮动�轮�轮组把同一个物体匀速提升到同一高度其中机械效率最高的是a.定�轮b.动�轮c.�轮组d.无法确定 题目和参考答案 coloring