资料提炼：在的83篇文献中，内容不同程度重复的有37篇，给予删除，对剩下的46篇进行分类整理，用于综述，其中18篇选为参考文献。
DATA EXTRACTION: Among the 83 papers, 37 were deleted because they were repeated in various degrees, and the rest 46 were classified for review, and 18 of them served as references.
论文的第一部分为绪论，提出了问题，介绍了研究目的和意义、进行了文献综述，介绍了研究内容与方法。
Part I of the Introduction paper, raises the issue, and introduces the purpose and significance of the research carrying out literature review, presenting research content and methods.
第一章绪论介绍了研究背景、意义，以及国内外有关的文献综述，最后介绍了研究内容和方法。
The first chapter introduces the study background, meaning and domestic and foreign literature summary, give the study content and method.
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