DIN EN 60721-3-4/A1:1997
环境条件分类.第3部分:环境参数组及其严酷程度的分类.第4节:在无天气防护位置固定使用的产品.修改件A1
Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities; section 4: Stationary use at non-weatherprotected locations; Amendment A1 (IEC 60721-3-4:1995/A1:1996); German version EN 60721