第一部分为绪论，主要介绍了论文选题的依据、国内外研究现状。
The first part introduces the basis of the thesis, domestic and international research.
本文首先阐述了论文的选题依据及研究意义。
This paper firstly expounds the basis of subject and significance of study.
本文首先阐述了论文的选题依据及研究意义。
This paper firstly expounds the basis of subject and significance of study.
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