double-packer down-hole sampling techniques 双栓塞钻孔测试与试验技术
Some superiorities of using down hole hammer counter circulation type continuous coring (sampling) method in gold ore exploration are expounded in this paper.
文中阐述了在金矿勘探中应用潜孔锤反循环连续取心（样）的优越性；
The present utility model discloses a down-hole depth-determining water sampling apparatus for solving a problem that depth-determining water sampling can not be realized in the prior art.
本实用新型的井下定深取水样装置，为了解决现有技术中无法定深取水的 问题而发明。
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