roller cone bit
(archaic) second-person singular simple present form of tap
A type of drill bit used to perforate rock to create a wellbore to oil and gas reservoirs
Alternative form of Xining
plural of home thrust
掘削クルーは頁岩層を貫く際に大きく摩耗したため、ローラーコーン式ドリルビットを交換した。
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