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。
2
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。
3
This paper gives a definition to the survey of language situation, an outline of language census and survey sampling at home and abroad.