31.在做“测�轮组机械效率 的实验中小强和同学们组装了如图所示的甲乙个�轮组每只�轮重都相同不计�擦和绳重 1对于甲图所示的 Template




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tomski31.在做“测�轮组机械效率 的实验中小强和同学们组装了如图所示的甲乙个�轮组每只�轮重都相同不计�擦和绳重 1对于甲图所示的 coloring