RESEARCH METHODThe stratified multi-stage cluster random sampling method was used in the survey.
研究方法本研究采用分层整群随机抽样方法进行抽样。
Questionnaire survey was used in this research, and researchers selected college students from more than 20 universities of China as research participants through snowball sampling on Internet.
方法：问卷调查法，透过网络采取滚雪球方式抽取二十多所高校的在校大学生为研究对象。
Questionnaire survey was used in this research, and researchers selected college students from more than 20 universities of China as research participants through snowball sampling on Internet.
方法：问卷调查法，透过网络采取滚雪球方式抽取二十多所高校的在校大学生为研究对象。
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