Based on the cluster structure of 4n-nucleus, a parity-dependent potential is derived by using a proper nuclear orbital wave function and the folding method.

基于对4n核结团结构的考虑，采用合理的核轨道波函数，并利用折叠模型导出了质量相近4 N核间的宇称相关势。

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All the wave function of a two-photon system with definite angular momentum and parity are found out, the polarization states of photons systematically analyzed.

求出了双光子系统的所有的波函数，这些波函数所代表的态都有一定的角动量和宇称，并且有系统地分析了这些态中光子的偏振情况。

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This paper puts forward an idea of how to set up a parity bookshop and focus on discussing its function of making up the library systematic default.

对图书馆与书店在合作过程中存在的问题及问题的形成进行了分析和探讨，并提出了解决问题的对策和建议，希望引起图书馆界和图书发行界的重视。

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