This article is about the classification 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。
Technical paper classification of all technical documents and files, number and place on file.
所有技术文件，技术资料及技术图纸的分类，编号归档工作。
Technical paper classification of all technical documents and files, number and place on file.
所有技术文件，技术资料及技术图纸的分类，编号归档工作。
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