分层取样 meaning in English

stratification sampling
stratified sampling

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重庆市城口锰矿床地质特征及分层取样法的运用效果
By sampling in different filter layer and analyse of water head damage in all sampling point , i draw a condusion about filter function of porcelain sand filter is superior to the general filters
通过滤层分层取样，对各取样点的水头损失的分析，得出瓷砂滤料较一般滤料过滤性能优越的结论。
A choice has also to be made between probabilistic ~ techniques ( such as random or stratified ~ ) and non - probabilistic ~ techniques ( such as judgmental , quota or convenience ~ )
另外要在两种取样方法中进行选择，是选概率取样法（例如随机或分层取样）还是选非概率取样法（例如判断取样、定额取样或方便取样）。
" whole - reservior sampling tester " and " multi - layer sampling tester for producing wells " are large - sized and new - style formation test apparatuses used for exploration wells and producing wells , which are automatic and digital
摘要全储层取样测试器和生产井分层取样测试器是用于油气裸眼勘探井和生产井的自动化、数字化的大型新式地层测试仪器。