如图所示小明同学利用图中�轮组将货物运送到楼上每个�轮等重不计绳重和�擦.若每次运送货物都匀速拉动绳子且提升同样的高度货物重g从 Template




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tomski如图所示小明同学利用图中�轮组将货物运送到楼上每个�轮等重不计绳重和�擦.若每次运送货物都匀速拉动绳子且提升同样的高度货物重g从 coloring