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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 51141-2015 |
Assessment standard for green retrofitting of existing building 既有建筑绿色改造评价标准 |
China National Standards retrofitting |
 English PDF |
| GB/T 50893-2013 |
Technical code for retrofitting of heating system on energy efficiency 供热系统节能改造技术规范 |
China National Standards retrofitting |
English PDF |
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