物理好图:http://physics.njnu.edu.cn/netcourse/lixue/teach_content/de
http://physics.njnu.edu.cn/netcourse/lixue/teach_content/default3.htm
体系的拉格朗日量或哈密顿量, mkt's equilibirum point area
http://physics.njnu.edu.cn/netcourse/lixue/teach_content/default3.htm
体系的拉格朗日量或哈密顿量, mkt's equilibirum point area