Data retrieval characteristics including reference data, read-only data, read groups, read size, searching criteria, and data grouping and aggregation.
Superseded editions will be recorded and filed to enable future retrieval for reference purposes if required.
废止版文件应作记录并归档，以备需要时检索参考。
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Combining the authors practical experience, this paper discusses the retrieval skills of CBM disc, and lists many examples, which is of great reference value to both teachers and learners.