The ratio of the energy output of a machine to the energy input.
由某种机械输出的能量与输入到其中的能量的比率。
Efficiency (EFF) Efficiency is the ratio of energy output to energy input, such as the ratio between the electrical energy input to a motor and the mechanical energy output at the shaft of the motor.
效率 效率是输出能量与输入能量的比率，例如输入到电动机的电能与电机轴承输出的机械能的之间的比率。
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