如图15所示小明分别用甲�轮乙�轮把重力 相同的物体匀速提升到相同的高度则 A.使用甲�轮可以省力 B 使用乙�轮可以改变力的方� C Template




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tomski如图15所示小明分别用甲�轮乙�轮把重力 相同的物体匀速提升到相同的高度则 a.使用甲�轮可以省力 coloring