In this work, the questionnaire was used for collecting data. Totally 268 questionnaires were sent out while 142 valid ones were got back. The ratio of valid questionnaire is 53%.
本研究采用问卷调查方法进行了数据收集，共发出调查问卷268份，回收有效问卷142份，有效问卷率为53%。
In this work, the questionnaire was used for collecting data. Totally 268 questionnaires were sent out while 142 valid ones were got back. The ratio of valid questionnaire is 53%.
本研究采用问卷调查方法进行了数据收集，共发出调查问卷268份，回收有效问卷142份，有效问卷率为53%。
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