up-hole drilling 中文意思是什麼
up-hole drilling
解釋
上向孔鑿巖-
It is welding drills that jion up with bit body, core barrel and adaper. it drills hole quickly and steadily. the surface of drilling and coring is smooth
它是一種焊接式鉆頭,由短鉆頭體,取芯管和接首三者聯結而成,鉆孔快而穩,巖芯表面光滑。
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