They are classification standards, classification system and classification methods of documents on industry and technology.
文章研究了工业技术文献的分类标准、分类体系和分类方法三个问题。
They are classification standards, classification system and classification methods of documents on industry and technology.
文章研究了工业技术文献的分类标准、分类体系和分类方法三个问题。
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