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列举并分析了ＣＡ与ＩＭ的频繁变动情况，认为这是检索系统一种自我完善的重要措施，同时指出我国的信息检索系统在这一方面所存在的问题
Citing and analyzing the frequent changes of CA and IM, this article considers that this is an important measure of self-improvement of the retrieval system, and points out the problems that our information retrieval system has in this aspect