方法：对项目点北碚区进行抽样调查。
The application of sample survey method in history research is analyzed.
本课题采取抽样调查和焦点小组访谈相结合的方法进行实证研究。
The study took a sample survey and focus group interviews combination of empirical research.
本课题采取抽样调查和焦点小组访谈相结合的方法进行实证研究。
The study took a sample survey and focus group interviews combination of empirical research.
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