在做“测�轮组机械效率 的实验中小明和同学们组装了如图所示的甲乙两个�轮组每只�轮及钩码重都相同不计�擦和绳重.则机械效率较大的是 Template




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tomski在做“测�轮组机械效率 的实验中小明和同学们组装了如图所示的甲乙两个�轮组每只�轮及钩码重都相同不计�擦和绳重.则机械效率较大的是 coloring