6.如图所示小明用�轮组提升一重物不计�轮与轴之间的�擦及绳重.若小明在5s内将绳子匀速�上拉6m拉力做了600j的功.已知此时�轮组的 Template




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tomski6.如图所示小明用�轮组提升一重物不计�轮与轴之间的�擦及绳重.若小明在5s内将绳子匀速�上拉6m拉力做了600j的功.已知此时�轮组的 coloring