It is a conservative system so all the energies are negative.
它是一个保守系统，所以所有的能量级都是负值。
The characteristic of conservative system is symplectic conservation.
在物理与力学中有大量保守体系的分析。
Optimal control system of state space is a conservative system, whose approximate method should be symplectic conservation.
状态空间的最优控制体系是保守的，其近似算法应当保辛。
According to the characters of the work of magnetic force, the concept of potential energy can be brought in the non conservative system-magnetic field.
根据磁力做功的特点，在非保守场———磁场中也可以引入势能的概念。
A calculation for period of a single freedom nonlinear conservative system vibrating in a large amplitude is performed, and the period formulae of some typical vibration problems are presented.
简要介绍了单自由度非线性保守系统作大振幅振动时周期的计算方法，并给出了几个常见典型振动问题的周期公式。
A calculation for period of a single freedom nonlinear conservative system vibrating in a large amplitude is performed, and the period formulae of some typical vibration problems are presented.
简要介绍了单自由度非线性保守系统作大振幅振动时周期的计算方法，并给出了几个常见典型振动问题的周期公式。
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