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。

youdao

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。

youdao