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。

youdao

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。

youdao