The differential equations of motion of systems are written.
列写系统的运动方程。
The differential equations of motion of the pantograph have been derived.
并推导了受电弓的运动微分方程。
On the form invariance of differential equations of motion for generalized mechanical system in terms of quasi-coordinates;
研究完整力学系统准坐标表示的运动微分方程在群的无限小变换下的形式不变性 。
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