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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 3884.20-2018 |
Methods for chemical analysis of copper concentrates—Part 20:Determination of mercury content—Solid sampling and direct mercury analysis method 铜精矿化学分析方法 第20部分：汞量的测定 固体进样直接法 |
China National Standards 20:Determination |
 English PDF |
| GB/T 5121.20-2008 |
Methods for chemical analysis of copper and copper alloys - Part 20:Determination of zirconium content 铜及铜合金化学分析方法 第20部分：锆含量的测定 |
China National Standards 20:Determination |
English PDF |
| GB/T 13477.20-2002 |
Test method for building sealants--Part 20:Determination of staining 建筑密封材料试验方法 第20部分:污染性的测定 |
China National Standards 20:Determination |
English PDF |
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