Methods: Adopt method of random sampling.
方法：采用随机抽样法。
Illustrates the sampling of this research program, as well as data collection and analysis methods.
说明了本调查研究的抽样方案以及资料收集和分析方法。
Illustrates the sampling of this research program, as well as data collection and analysis methods.
说明了本调查研究的抽样方案以及资料收集和分析方法。
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