如图所示小明分别用甲乙两�轮把同一桶沙子从一楼地面提到二楼地面用甲�轮所做的总功为w1机械效率为η1用乙�轮所做的总功为w2机械效率 Template




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tomski如图所示小明分别用甲乙两�轮把同一桶沙子从一楼地面提到二楼地面用甲�轮所做的总功为w1机械效率为η1用乙�轮所做的总功为w2机械效率 coloring