用假设弱透镜焦距表达式是一个幂级数中的第一项的方法，可以导出相当准确且便于实用的电磁电子透镜物镜焦距公式。

By assuming the weak lens focal length expression to be the first term in a power series a simple and accurate formula can be derived for the objective focal length of a magnetic electron lens.

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结果洋金花对大鼠后放发作行为的发作级数有明显减轻作用（P<0.05），但减轻程度比卡马西平组弱（P<0.01）。

Results Datarametel L relieved the progression of after-discharge seizure behavior in experiment rats significantly(P<0.05)The effects was weaker than that of carbamazepine(P<0.01).

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