7.用图3所示的�轮组将重为10n的物体匀速提升01m拉力f=6n在这一过程中下列说法正确的是 A.拉力所做的有用功为1j B.拉力 Template




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tomski7.用图3所示的�轮组将重为10n的物体匀速提升01m拉力f=6n在这一过程中下列说法正确的是 a.拉力所做的有用功为1j b.拉力 coloring