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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 45183-2025 |
Plastics - Instrumental Determination of Irradiation in Weathering Tests - General Principles and Basic Test Methods {译} 塑料-气候老化试验中辐照量的仪器测定-总则和基本测试方法 |
China National Standards Basic principles methods |
 English PDF |
| GB/T 7027-2002 |
Basic principles and methods for information classifying and coding 信息分类和编码的基本原则与方法 |
China National Standards Basic principles methods |
English PDF |
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