如图所示物体a和b所受重力都为100牛不考��轮重力及绳与�轮的�擦当用力分别匀速提起物体a和b时力fa为5050牛若物体b在10秒 Template




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tomski如图所示物体a和b所受重力都为100牛不考��轮重力及绳与�轮的�擦当用力分别匀速提起物体a和b时力fa为5050牛若物体b在10秒 coloring