These models could serve as the theoretical bases for reasonable design of cigarettes structure, proper selection of raw materials and reduction of tar delivery.
该数学模型为合理设计烟支结构、适当选择卷烟辅料、有效控制卷烟焦油释出量提供了理论依据。
There are two manufacturing methods of pyridine bases: extraction from coal tar and catalytic synthesis from ammonia, formaldehyde and acetaldehyde.
吡啶碱的生产方法主要有两种：一是从煤焦油中提取；二是从氨和甲醛、乙醛的合成过程中获得。
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