“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	sealing material sealing material with special media resistance sealing off channel sealing structure sealing technique of vacuum electronic device sealing up seal inscriptions seal memorial to the throne seal mineral material seal of chairman of China Civil Rights Protection League seal of compressor Seal of Empress Seal of Imperial Concubine Li Seal of Imperial Concubine Shao Seal of the Central Executive Committee of the Soviet Republic of China seal pressure control system sealprint examination seal running test Seals Seals and Inscriptions by Chinese Calligraphers and Painters Seals Carved by Tong Changling seal scripts seals made by Cheng Sui seals made by Deng Shiru seals made by Ding Jing

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