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  1. Petroleum - Wikipedia

  2. 石油(烃类混合物)_百度百科

  3. Oil and petroleum products explained - U.S. Energy Information ...

  4. 石油 - 维基百科,自由的百科全书

  5. Crude oil | Definition, Characteristics, & Facts | Britannica

  6. Petroleum | Energy, Products, & Facts | Britannica

  7. Oil (petroleum) - U.S. Energy Information Administration (EIA)

  8. Petroleum - Education | National Geographic Society

  9. Petroleum production | Definition & Facts | Britannica

  10. Crude Oil vs. Petroleum - What's the Difference? | This vs. That