Investigation of pollution situation of bottom layer of a landfill by boring sampling was carried out.

通过钻探取样对一个垃圾场底部土层的污染状况进行了现场调查。

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Methods General investigation was adopted to understand the water supply situation in rural areas and stratified random sampling was used to monitor the water quality.

方法按照相关调查表要求，对农村供水情况进行普查，供水水质采用分层随机抽样的方法进行监测。

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This paper gives a definition to the survey of language situation, an outline of language census and survey sampling at home and abroad.

文章论述了语言文字使用情况调查的含义，介绍了本世纪以来国内、外语言普查和抽样调查的一些重要情况。

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