Bibliography information service is facing new chance and challenge under digital environment.
数字环境下，书目情报服务面临着新的机会和挑战。
Digital reference service system is the core content of library construction under network environment.
数字参考咨询服务系统是网络环境下图书馆建设的核心内容。
Digital reference service system is the core content of library construction under network environment.
数字参考咨询服务系统是网络环境下图书馆建设的核心内容。
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