gas installation pipe 气体装置喉管

Installation Pipe Diameter 安装管径

pipe installation 管道安装 ; 管路装置

wet pipe valve installation 湿式阀装置

installation hole of pipe duct 管沟安装孔

casing pipe installation 套管敷设

underground pipe installation 地下管道安装

installation of pipe [机] 管系安装

installation of oxygen pipe line 氧气管道安装

cable installation in pipe [电] 穿管敷设