期刊文献是高校教学、科研和管理工作的主要信息源。
Periodical document is the main information resources of teaching, researching, managing work in College.
地面防空雷达作为现代防空体系的主战装备和主要信息源之一，它的生存性面临着严重的威胁。
As one of the main weapon and the information resources in the modern air-defence system, the viability of antiaircraft radar on the ground is confronted with serious threats.
在总结著录信息源的产生、特点及作用的同时，重点论述取消主要信息源的概念及有关规定的理由。
Discusses the origin, features and functions of the source of information in description and studies the reasons for cancelling the chief source of information.
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