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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 17215.9321-2016 |
Electricity metering equipment—Dependability—Part 321: Durability testing of the stability of metrological characteristics by applying elevated temperature 电测量设备 可信性 第321部分：耐久性-高温下的计量特性稳定性试验 |
China National Standards 321: |
 English PDF |
| GB/T 18802.321-2007 |
Components for low-voltage surge protective devices - Part 321: Specifications for avalanche breakdown diode(ABD) 低压电涌保护器元件 第321部分：雪崩击穿二极管（ABD）规范 |
China National Standards 321: |
English PDF |
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