NF C20-003-3*NF EN 60721-3-3:1995 环境条件分类 第3部分:环境参数及其恶劣程度的成组分类 第3节:气候防护场所固定用
Classification of environmental conditions. Part 3 : classification of groups of environmental parameters and their severities. Section 3 : stationary use at weatherprotected locations.