短語(yǔ)詞組短語(yǔ)hole -drilling technique 小孔釋放法deep hole coring drilling 深孔巖心鉆探hole system drilling 孔系加工multi hole directional drilling 多開(kāi)眼定向鉆井long hole directional drilling 深孔定向鉆進(jìn) 返回 hole drilling