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。
2
There are two manufacturing methods of pyridine bases: extraction from coal tar and catalytic synthesis from ammonia, formaldehyde and acetaldehyde.