短语词组短语butt -fusion welded joint 热熔对接接头butt fusion angle welder 角度焊机butt fusion welding machine 热熔对接焊机butt fusion welding 对头熔接;对接熔焊;热熔对接焊Plastic pipe butt fusion machine 发明名称polyethylene fitting from butt fusion 聚乙烯焊制管件 返回 butt fusion