DIN EN 300019-1-4-2016 环境工程(EE).电信设备的环境条件和环境试验.第1-4部分:环境条件的分类.非抗大气影响场所用固定设备
Environmental Engineering (EE) - Environmental conditions and environmental tests for telecommunications equipment - Part 1-4: Classification of environmental conditions; Stationary use at non-weatherprotected locations (Endorsement of the English version