Casings of metal for oilwells的意思|示意

油井金属套管 压缩空气管用金属配件 Fittings of metal for compressed air ducts 油井金属套管 Casings of metal for oilwells 油井用金属套管 Oilwells (Casings of metal for –) ..

油井用金属套管 ... 缆绳和管道用金属夹 Clips of metal for cables and pipes 油井用金属套管 Casings of metal for oilwells 金属雨水管 Gutter pipes of metal ...