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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 20939-2007 |
Structuring principles for technical products and technical product documentation - Letter codes - Main classes and subclasses of objects according to their purpose and task 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 |
China National Standards Structuring principles technical |
 English PDF |
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