The air-driven down-hole hammer drilling is still very effective and speedy in well drilling in karst limestone area.
在水文水井中，气动潜孔锤钻进仍可发挥它高效率、高速度的作用。
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；
Used with our down-hole hammer, it can drill through complicated formations in which drilling holes are easy to collapse.
配合我厂生产的潜孔锤，可以钻穿复杂，易坍塌底层。
Used with our down-hole hammer, it can drill through complicated formations in which drilling holes are easy to collapse.
配合我厂生产的潜孔锤，可以钻穿复杂，易坍塌底层。
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