lifter hole 中文意思是什麼
lifter hole
解釋
輔助炮眼-
The extension drill rod which can be used for higher capacity drill, the drill hole can be extended to sezeral meetrs, when drilling the straight hole, the core lifter can help coring
選用加長鉆桿于較大能力的鉆機,可將鉆孔延深至數米,鉆垂直孔時,可採用取芯器配合取芯。
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