PN E04555-36-1989
电器及电子产品.环境条件分类.环境参数群分类及其严重性.船舶环境[IEC出版物译文721-3-6(1987)]
Electrical and electronic products Classification of environmental conditions Classification of groups of environmental parameters and their severities Ship environment [Translation of IEC Publication 721-3-6 (1987)]