In order to simplify calculating, concept of virtual velocity and virtual power are led into. The principle of virtual power is discussed.
为了简化计算，引入了虚速度、虚功率的概念，并推导出虚功率原理。
In order to simplify calculating, concept of virtual velocity and virtual power are led into. The principle of virtual power is discussed.
为了简化计算，引入了虚速度、虚功率的概念，并推导出虚功率原理。
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