动量守恒原理则不管内力的性质如何（保守的或非保守的）都能适用。
The principle of conservation of momentum holds whatever the nature of the internal forces, conservative or not.
通过寻找积分因子来建立非完整非保守系统的守恒律，讨论了存在守恒定律的必要条件，并举例说明其应用。
A single character for use in integral invariant of nonholonomic conservation systems is proved and is subject to some conditions.
应用推荐