用如图所示甲乙两个�轮组分别提起相同的质量的物体.两个�轮组的动�轮的质量相同不计�擦则a.f甲 Template




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tomski用如图所示甲乙两个�轮组分别提起相同的质量的物体.两个�轮组的动�轮的质量相同不计�擦则a.f甲 coloring