petroleum and natural gas meaning in English

石油天然气

Standard for petroleum and natural gas engineering drawings
石油天然气工程制图标准
Petroleum and natural gas industries - piping
石油和天然气工业.管道
The rapid development of vietnam ' s petroleum and natural gas industry
迅速发展中的越南油气业
Petroleum and natural gas industries - aluminium alloy drill pipe
石油和天然气工业.铝合金钻杆
Petroleum and natural gas processing . management of process hazards
石油天然气加工.工艺危害管理

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