如图所示是由定�轮和动�轮组成的简单机械ab物体的重分别是4n和2n当ab处于平衡时弹簧测力计cd的示数分别是22n和44n Template




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tomski如图所示是由定�轮和动�轮组成的简单机械ab物体的重分别是4n和2n当ab处于平衡时弹簧测力计cd的示数分别是22n和44n coloring