GB/T 4798.4-2023
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
Classification of environmental conditions—Classification of groups of environmental parameters and their severities—Part 4: Stationary use at non-weatherprotected locations
GBT4798.4-2023, GB4798.4-2023