Machining the spark plug hole and counter bore at a compound Angle.
加工火花塞孔与反孔的复合角度。
2
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；
3
This requires only one hole in the sink or counter top, and will free up space in your kitchen.