小明利用如图所示的简单机械移动物体a时.当沿不同方�分别用f1f2f3的力以不同速度匀速拉动物体时忽略绳子与�轮的�擦下列说法中正确 Template




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tomski小明利用如图所示的简单机械移动物体a时.当沿不同方�分别用f1f2f3的力以不同速度匀速拉动物体时忽略绳子与�轮的�擦下列说法中正确 coloring