短語詞組短語steel casing buried pipe 鋼套鋼直埋管道casing protected pipe 套管;保護管casing -pipe connected drilling tool 套管跟進鉆具casing g pipe 套管welding of casing steel pipe 鑄鋼管焊接flexible protective casing for pipe 撓性保護管套casing pipe installation 套管敷設 返回 casing pipe