美利体育登录入口官网:JIS C 60721-3-3:1997 环境条件分类.第3部分:环境参数组及其严酷程度分类.第3节:在有气候防护场所的固定使用
Classification of environmental conditions Part 3: Classification of groups of environmental parameters and their severities Section 3: Stationary use at weatherprotected locations