NEN 10721-3-9-1994 60721-3-9-1995 环境条件分类.第3部分:环境影响程度分级和极限值.第9节:产品内的微型气候
Classification of environmental conditions. Part 3: Classification of groups of environmental parameters and their severities. Section 9: Microclimates inside products (IEC 721-3-9:1993)