This article discusses the four characteristics of a modern library: automation of management, digitization of literature, networking of delivery and personalized services.
现代图书馆的四个特征：管理自动化，文献数字化，传递网络化和服务个性化。
Personalized information services system of digital library is the source of life.
个性化是数字图书馆信息服务生命之源。
PDF provides abundant personalized services for the creator and the reader of the file, this paperelaborated the advantages and the significance of the application of PDF in library.
PDF文档为创建者和阅读者提供了丰富的个性化服务，本文在此基础上阐述了PDF文档在图书馆中应用的优势，以及图书馆利用PDF文档开展各项服务的意义。
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