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Chinese Standard: GB/T 5094.2-2018

Industrial systems,installations and equipment and industrial products—Structuring principles and reference designations—Part 2:Classification of objects and codes for classes

IDT  IEC 81346-2:2009

全国电气信息结构文件编制和图形符号标准化技术委员会(SAC/TC 27)

GB/T 5094的本部分规定按用途或任务划分的项目分类及在参照代号中表示项目子类的字母代码。
本部分适用于各技术领域的项目,例如:电气、机械、土木工程以及所有工业分支(如能源、化工工业、建筑工程、造船和海洋技术),并能够用于各技术学科的设计过程。

This standard is the original Chinese electronic standard.
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