某实验小组分别用如图所示的甲乙两个�轮组匀速提起相同的重物所用的拉力分别为f1和f2机械效率分别为η1和η2不计绳重及�擦下列说法正确 Template




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tomski某实验小组分别用如图所示的甲乙两个�轮组匀速提起相同的重物所用的拉力分别为f1和f2机械效率分别为η1和η2不计绳重及�擦下列说法正确 coloring