... Drill Core Method 钻芯法 Drill The Coal Core 钻取煤芯 drill core stores 岩心库 ...
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drill the coal core
钻取煤心
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Based on the prospecting practices of many years, the paper has summarized 8 general lithologic features of core under normal stratigraphic sequence before drilling to the coal-beds in drill hole.
根据多年的勘查实践，总结提出了八条正常地层层序下钻孔见煤前的一般岩心岩性特征，对指导见煤预告等大有裨益。
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