短語詞組短語pipe screw thread 琯螺紋oilfield pipe screw thread 石油琯螺紋Pipe -thread 琯道式螺紋casing pipe round thread 套琯圓螺紋pipe plug thread 琯塞螺紋pipe style thread 琯道式螺紋petroleum pipe -thread 石油琯螺紋Dryseal straight pipe internal thread 乾密封燃油直琯螺紋PIPE -THREAD SEALANT SYSTEM 琯螺紋密封劑 返回 pipe thread