摘要：
The functions of computer-based classified retrieval are:1)improving group retrieval performance of machine retrieval system;2)constituting new retrieval strategy im a collocative way;3 ) Using both the thesaurus and the key words of retrieval system to optimize the retrieval system;4 ) increasing retrieval entrance;5) promoting the compatibility and interchangebility between retrieval systems. China should combine classification retrievals as the key point of study.
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