The first part is the basic theory of EPS. 第一部分主要介紹每股收益的基本理論。
In this paper based upon the knowledge of ordinary differential equation and its stability theory, we study the solutions of Dirac equation. 本文主要利用常微分方程的基本理論及其定性理論，采用打靶法研究狄拉克方程解的存在性問(wèn)題。
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