张强同学利用如图所示的�轮组将货物运送到楼上图中每个�轮等重不计绳子重和�擦.如果所送货物重g从200n开始逐渐增加直到绳子被拉断.每次 Template




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tomski张强同学利用如图所示的�轮组将货物运送到楼上图中每个�轮等重不计绳子重和�擦.如果所送货物重g从200n开始逐渐增加直到绳子被拉断.每次 coloring