NEN 10721-3-6-1994
IEC 721-3-6-1987/+A1-1991 环境条件分类．第3部分：环境参数组及其严酷程度分类．第6节：船舶制造环境
Classification of environmental conditions.Part 3:Classification of groups of environmental parameters and their severities.Section 6:Ship environment(IEC 721-3-6:1987+A1:1991)