Single cylinder core, can be installed into the mould directly, require smoothness at the connection with the cylinder, high requirement of the hole drilling, smaller volume.
单独气缸芯子，直接安装到模具里面，要求与气缸接触处光滑，开孔要求比较高，体积比较小。
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。
The swivel-tube barrel can effectively increase core recovery rato. suitable for drilling in formations in which oblique hole comes easy. It is effective to assure hole quality.
单动双层岩芯管钻具结构简单、操作方便、同轴度好、适用寿命长，能有效地提高岩、矿芯的完整度。
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