DIN EN IEC 60721-3-3:2020 环境条件分类 第3-3部分:环境参数组的分类及其严重性 在防风雨地点的固定使用(IEC 60721-3-3:2019) 德文版 EN IEC 60721-3-3:2019
Classification of environmental conditions - Part 3-3: Classification of groups of environmental parameters and their severities - Stationary use at weatherprotected locations (IEC 60721-3-3:2019); German version EN IEC 60721-3-3:2019