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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 20936.4-2017 |
Gas detectors for explosive atmospheres—Part 4：Performance requirements of open path detectors for flammable gases 爆炸性环境用气体探测器 第4部分：开放路径可燃气体探测器性能要求 |
China National Standards 4：Performance |
 English PDF |
| GB/T 13871.4-2007 |
Rotary shaft lip type seals incorporating elastomeric sealing elements - Part 4：Performance test procedures 密封元件为弹性体材料的旋转轴唇形密封圈 第4部分：性能试验程序 |
China National Standards 4：Performance |
English PDF |
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