A crystalline compound, C18H 18, derived from pine tar, fossil resins, and tar oils.
一种结晶化合物，C18 H18，从由松焦油、化石树脂及焦油中提取。
Article 18 the State shall lay down the tar content grading standards for cigarettes and cigars.
第十八条国家制定卷烟、雪茄烟的焦油含量级标准。
Article 18 the State shall lay down the tar content grading standards for cigarettes and cigars.
第十八条国家制定卷烟、雪茄烟的焦油含量级标准。
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