The method of research, the writer mainly uses the comparison method, investigating data and experience Summary.
关于本文的研究方法，笔者主要使用比较法、数据调查法和经验总结法。
Methods: This article USES the qualitative comparison analysis based on Fuzzy-set method.
方法：使用基于模糊集的定性比较方法。
The research technique mainly USES the comparison analytic method.
研究方法主要采用比较分析法。
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