Standard No.:	GB/T 20939-2007
English Name:	Structuring principles for technical products and technical product documentation—Letter codes—Main classes and subclasses of objects according to their purpose and task
Chinese Name:	技术产品及技术产品文件结构原则 字母代码 按项目用途和任务划分的主类和子类
Chinese Classification:	K09    Hygiene, safety and labor protection
Professional Classification:	GB    National Standard
Source Content Issued by:	AQSIQ;SAC
Issued on:	2007-7-11
Implemented on:	2008-1-1
Status:	abolished
Abolished on:	2026-01-28
Superseding:	公告：国家标准公告 2026年第5号
Target Language:	English
File Format:	PDF
Word Count:	32000 words
Translation Price(USD):	900.0
Delivery:	via email in 1~3 business day

本标准等同采用IEC PAS 62400：2005，规定了按用途和任务划分的项目类别及字母代码，扩展了GB/T5094.2-2003表1内容，并增加了子类代码。
本标准适用于结构、工艺、电气工程等所有学科以及标准，例如发电、配电、加工机械、造船工业、海洋工程等。