短語詞組短語steel casing buried pipe 鋼套鋼直埋琯道casing protected pipe 套琯;保護琯casing -pipe connected drilling tool 套琯跟進鑽具casing g pipe 套琯welding of casing steel pipe 鑄鋼琯銲接flexible protective casing for pipe 撓性保護琯套casing pipe installation 套琯敷設(shè) 返回 casing pipe