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.不计绳重及�擦下列说法正确的是 A.甲图省力机械效率甲图大b.甲图省力 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.不计绳重及�擦下列说法正确的是 a.甲图省力机械效率甲图大b.甲图省力 coloring