Home HSK Vocabulary HSK 7–9 燃油 燃油 rán yóu HSK 7–9 · C2 Meanings fuel oil Quick facts HSK LevelHSK 7–9 CEFRC2 ← Back to HSK 7–9 Overview Practice 燃油 with flashcards MandoBridge uses spaced repetition to help you remember HSK 7–9 vocabulary — free on iOS and Android. ← All HSK 7–9 vocabulary