Catalytic cracking is a main oil refining technique of making heavy oil lighter, and the mark and pillar of oil refining industry.
催化裂化是重质油轻质化的一个主要炼油工艺，是石油加工工业的标志和支柱。
Catalytic cracking is a main oil refining technique of making heavy oil lighter, and the mark and pillar of oil refining industry.
催化裂化是重质油轻质化的一个主要炼油工艺，是石油加工工业的标志和支柱。
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