如图6所示工人用�轮组提升重物已知�轮质量相同若把同一货物匀速提升相同的高度不计绳子与�轮间的�擦 A.使用定�轮比动�轮省力但 Template




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tomski如图6所示工人用�轮组提升重物已知�轮质量相同若把同一货物匀速提升相同的高度不计绳子与�轮间的�擦 a.使用定�轮比动�轮省力但 coloring