城市输气管线
urban transmission pipeline
干线输气管道
trunk gas pipeline
trunk gas transportation pipeline
高压输气管线
high-pressure gas transmission pipeline
集气管线堵塞
gathering pipeline plugging
陕京二线输气管道工程
the Second Gas Transportation Pipeline Engineering
输气管线
gas transmission pipeline
gas pipeline
pipeline
output gas tube line
天然气输气管道
natural gas transfer pip
natural gas pipeline
natural gas transmission pipeline
西气东输输气管道
west-east gas transmission pipeline
集输管线
pipeline
gathering pipeline
gathering pipelines
gathering and transporting pipeline
石油集输管线
pipelines for collection and transfer of petroleum