在图所示的�轮组中用110n的力在5s内把重为200n的物体匀速提高2m则 A.对重物做的有用功约为200j b.�轮组的机械效率约为90 Template




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tomski在图所示的�轮组中用110n的力在5s内把重为200n的物体匀速提高2m则 a.对重物做的有用功约为200j b.�轮组的机械效率约为90 coloring