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GB/T 20138-2023 Protection level of electrical equipment enclosures against external mechanical impact (IK code) 电器设备外壳对外界机械碰撞的防护等级（IK代码） - 中英文版 |
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GB/T 4798.4-2023 Classification of environmental conditions Classification of environmental parameter groups and their severity levels Part 4: Stationary use in places without weather protection 环境条件分类 环境参数组分类及其严酷程度分级 第4部分：无气候防护场所固定使用 - 中英文版 |
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