方法：采取整群抽样办法，对被调查县1996年前的所有改水工程水氟含量、打井深度、井壁结构材料和井周封闭土质进行调查分析。
Methods: Using cluster sampling, the water fluoride content, depth of well, materials of well as well as quality of blocking soil of FCRWQIP before 1996 in Xinyang were measured.
本文采用结构化的贴体网格，来对模拟分子的运动进行定位和对碰撞对进行抽样统计。
With the structured body-fitted grids, the movement of simulate molecular is traced and the collision molecules is selected.
采用分层随机抽样法对长武王东沟小流域农业产业结构现状进行了调查分析。
This report analyzed the agricultural industry structure of Wangdonggou watershed in Changwu county based on investigation.
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