中心取样钻探是一种全新的钻探方法，具有效率快、取样准确、岩样采取率高的特点。
The central sampling drilling is a new method which has the characteristics of efficient, accurate sampling and high percentage recovery of Core.
在印度旁遮普省昌迪加尔的45所托儿所(anganwadi)中心采用多级分层随机取样法选择了806名6岁以下儿童。
We randomly selected 806 children under 6 years of age from 45 primary anganwadi (childcare) centres in Chandigarh, Punjab, India, that were chosen through multistage stratified random sampling.
人脸部图形取样序和取样中心理资源分配的研究。
Sampling order and mental resource distribution during the sampling processing of the facial figures.
对于国外产品，可由我中心委托相关人员在产品原产地抽取样品。
For the foreign products, their samples can be sampled by related persons trusted by the Testing center in the homeplace.
立体几何图形取样序和取样中心理资源分配的研究。
Sampling order and mental resource distribution during the sampling processing of the 3-dimension figures.
为了更合理地分析中心偏析，还对不同直径的取样钻头造成同一铸坯中心偏析的分析偏差进行了必要的研究。
In order to analyze central segregation more accurately, the error in chemical analysis caused by sampling with two drills of different diameters is studied.
为了更合理地分析中心偏析，还对不同直径的取样钻头造成同一铸坯中心偏析的分析偏差进行了必要的研究。
In order to analyze central segregation more accurately, the error in chemical analysis caused by sampling with two drills of different diameters is studied.
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