工人利用如图所示的�轮组在20s内将200n的重物匀速拉到9m 高的楼上所用的拉力是80n.求1有用功是多�2�轮组的机械效率 Template




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tomski工人利用如图所示的�轮组在20s内将200n的重物匀速拉到9m 高的楼上所用的拉力是80n.求1有用功是多�2�轮组的机械效率 coloring