-
Also in development are new drilling muds that cool the drill bit during operation.
新的钻探泥浆(用于在操作时冷却钻头)也在开发中。
youdao
-
Drilling with cone( drag) bit in the section.
此段地层采用牙轮（刀）头钻进。
youdao
-
Drilling with cone( drag) bit in the section.
此段地层采用牙轮（刀）头钻进。
youdao