方法应用实证研究和文献比较方法。
Methods Positivism study and document compare analysis were applied.
方法：应用实证研究、定量分析和文献比较方法。
Methods. Positivism study, quantitative analysis and document comparison analysis were applied.
方法：应用实证研究、定量分析和文献比较方法。
Methods. Positivism study, quantitative analysis and document comparison analysis were applied. Results.
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