The appearance of digital library presumes the necessity of library virtual reference service being created.
数字图书馆的出现意味着图书馆数字式（虚拟）参考咨询服务产生的必然；
The new thought of knowledge management could be introduced into library virtual reference service, and the implementation of library knowledge management could begin with virtual reference service.
提出将知识管理理念导入图书馆虚拟参考咨询服务，把虚拟参考咨询服务作为图书馆知识管理实施的切入点的观点并进行论证。
Virtual reference service usually adopts three models in digital library.
数字图书馆中虚拟参考咨询服务通常采用三种模式。
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