2.如图所示在不计绳重和�擦的情况下用动�轮把重40n的物体匀速提高2m所用的拉力为25n则拉力做功是 J动�轮的机械效率是 果把 Template




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tomski2.如图所示在不计绳重和�擦的情况下用动�轮把重40n的物体匀速提高2m所用的拉力为25n则拉力做功是 j动�轮的机械效率是 果把 coloring