短语词组短语oil charging piping 注油管系oil -piping layout 油导管oil well piping 油井管oil fuel piping 燃油管系oil lubricating piping 润滑油管路lube oil supply piping 润滑油供油管道fuel oil injection piping 高压供油管路main oil gas piping 大油气管线 返回 oil piping