12.如图所示用相同的�轮和绳子分别组成的甲乙两个�轮组把相同的钩码提升相同的高度在不计绳重及机械�擦的情况下甲所用的拉力 乙所用的 Template




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tomski12.如图所示用相同的�轮和绳子分别组成的甲乙两个�轮组把相同的钩码提升相同的高度在不计绳重及机械�擦的情况下甲所用的拉力 乙所用的 coloring