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。
This article discuss three problems in classification of documents on Mechanics:classification standards, classification system, and classification methods of documents on Mechanics.
力学文献的分类标准；力学文献的分类体系；力学文献的分类方法。
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