The classification, grade, numbering and administration of reference materials in China is explained.

阐述了我国标准物质的分类、分级、编号及其管理。

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This paper deals mainly with some problems lying in the concept and set-up of the category and the numbering system in "Books Classification of China Library" (Third Edition).

本文主要探讨了《中图法》(第三版)在类目概念、类目设置和类号等方面存在的问题。

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