Oleum:
Oleum (Latin "oleum" = "oil"), or fuming sulfuric acid, is a solution of various compositions of sulfur trioxide in sulfuric acid, or sometimes more specifically to disulfuric acid (also known as pyrosulfuric acid).
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发烟硫酸:
发烟硫酸（化学式：H2SO4.xSO3）是生产硫酸的过程中的生成物。
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Oleum发烟硫酸