通常可以表示为大量子数目情形下量子力学“减少”到经典力学和经典电磁学。
This is often expressed by saying that in case of large quantum numbers quantum mechanics "reduces" to classical mechanics and classical electromagnetism .
论述了经典电磁学的基本方程最少应有几条。
The minimum of the basic equations of classical electromagnetism is discussed.
经典电磁学的规律的数学表述，有许多种不同的结构方案，它们各有其缺点。
For the mathematical description of the basic laws of the classical electromagnetics there existed some different systems and each of them has its own shortcomings.
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