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Petroleum - Wikipedia
石油(烃类混合物)_百度百科
Oil and petroleum products explained - U.S. Energy Information ...
石油 - 维基百科,自由的百科全书
Crude oil | Definition, Characteristics, & Facts | Britannica
Petroleum | Energy, Products, & Facts | Britannica
Oil (petroleum) - U.S. Energy Information Administration (EIA)
Petroleum - Education | National Geographic Society
Petroleum production | Definition & Facts | Britannica
Crude Oil vs. Petroleum - What's the Difference? | This vs. That