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The research method is the questionnaire survey.
本研究采取问卷调查法。
youdao
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The application of sample survey method in history research is analyzed.
方法：对项目点北碚区进行抽样调查。
youdao
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The application of sample survey method in history research is analyzed.
方法：对项目点北碚区进行抽样调查。
youdao