利用如图所示的甲乙两�轮组在相同的时间内用大小相同的力f1和f2分别把质量相等的重物g1和g2提升相同的高度则 A.甲�轮组的额外功 Template




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tomski利用如图所示的甲乙两�轮组在相同的时间内用大小相同的力f1和f2分别把质量相等的重物g1和g2提升相同的高度则 a.甲�轮组的额外功 coloring