另外，本文还建立了目前文献中还未出现的置换塔模型，与聚合釜模型一起，构成了整个聚合单元的完整数学模型。

Furthermore, the displacement column model is built, combined with the model of the CSTR model, they have made up of the total polymerization unit model.

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采用文献资料法、访谈法和测试法，在分析以往单元教学实践经验与教训的基础上，进行大单元教学的实践。

By the ways of documentation, interview and test, large unit teaching was applied on the basis of the previous unit teaching experience.

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“网络文献”所具有的三个层次的信息分别是：物理载体层次、元数据层次和信息单元层次。

Web documents have information in three levels, i. e. the levels of physical media, metadata and information unit.

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