12.用如右图所示�轮组甲和乙提起同样重的物体时甲�轮组的机械效率为η甲乙�轮组的机械效率为η乙则可判定η甲 η乙.如果用乙�轮组第一次 Template




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tomski12.用如右图所示�轮组甲和乙提起同样重的物体时甲�轮组的机械效率为η甲乙�轮组的机械效率为η乙则可判定η甲 η乙.如果用乙�轮组第一次 coloring