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动量定理的研究对象一般为一个物体,但有时用动量定理来解决物体系的力学问题,不仅可行,而且还能使问题的求解变得异常简捷和巧妙.
The object of momentum theorem is generally an object, but sometimes using the momentum theorem to solve the mechanical problems of the object system is not only feasible, but also makes the solution of the problem extremely simple and ingenious.