Methods By random sampling method, 9 refectories and 366 students usually having their lunch at schools were drawn from Fangshan District, an anonymous questionnaire survey was conducted among them.

方法采用随机抽样的方法，对房山区9所中小学校食堂及366名在校就餐的学生进行膳食及营养教育相关情况的问卷调查。

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This paper introduced several methods about the concrete strength inspection: the sampling method given by the present specification; simple random sampling without replacement; stratified sampling.

具体介绍了砼强度检测抽样的几种方法：现行规程抽样法；简单随机抽样法；分层抽样法。

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This paper presents a new sampling method, which is called sampling method by allocating random order to percentiles based on some random simulation problems of statistical computation.

该文针对统计计算中的某些随机模拟问题提出了分位点随机配序抽样法。

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