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。
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。
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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