2.下列说法中正确的是 A力对物体做功多说明物体的位移一定大 b静�擦力总是做正功�动�擦力总是做负功 c作用力做功反作用力也 Template




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tomski2.下列说法中正确的是 a力对物体做功多说明物体的位移一定大 b静�擦力总是做正功�动�擦力总是做负功 coloring