如图所示是建�工人利用�轮组从竖直深井中提取泥土的情形.某次操作中工人用400n的拉力f在1min内将总重为900n的泥土匀速提升5m.在 Template




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tomski如图所示是建�工人利用�轮组从竖直深井中提取泥土的情形.某次操作中工人用400n的拉力f在1min内将总重为900n的泥土匀速提升5m.在 coloring