“Pfaff-Birkhoff principle”的概念、定义、翻译、参考文献-科学参考

单词	Pfaff-Birkhoff principle
释义	Pfaff-Birkhoff principle Encyclopedia 理学力学变分原理释 Pfaff-Birkhoff principle普法夫-伯克霍夫原理将G.D.伯克霍夫在1927年给出的一类积分变分原理推广到包含时间的情形从而得到的积分变分原理。
随便看	conservation of angular momentum conservation of aquatic ecosystem conservation of Chinese ancient books conservation of crop germplasm resources conservation of energy conservation of energy, energy conservation conservation of fishery resources conservation of herbage germplasm conservation of magnetic flux conservation of mass conservation of mass-energy conservation of mechanical energy conservation of molecular orbital symmetry conservation of moment of momentum conservation of momentum conservation of number principle Conservation of Oil Paintings conservation of orbital symmetry conservation of particle number conservation of rare and endangered medicinal resources conservation of resource theory conservation of tea germplasm conservation of terrestrial ecology conservation of vorticity conservation of water source areas

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