The paper, based on the model of "block of time" cost calculator, makes a simple model to accommodate for the library practice of virtual reference services in our country.
在介绍“间隔时间”成本预算模型的基础上，对该模型进行简化，使其适合中国图书馆界虚拟参考咨询服务的实践。
This paper puts forward a train of thought of the lowest cost quantitative analysis and constructs a market segmentation decision model which is used for reference in practice.
本文提出了定量分析中的最低成本法的思路，并形成了可借鉴的决策模型。
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