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。

youdao

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。

youdao