如图所示建�工人用�轮组提升重为220n的泥桶动�轮重为20n不计�轮与轴之间的�擦及绳重 若工人在5s内将绳子匀速�上拉6m则泥桶 Template




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tomski如图所示建�工人用�轮组提升重为220n的泥桶动�轮重为20n不计�轮与轴之间的�擦及绳重 若工人在5s内将绳子匀速�上拉6m则泥桶 coloring