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关注：1
2013-05-23 12:21
求翻译：耐火等级为二级，设计使用年限为50年。是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
耐火等级为二级，设计使用年限为50年。
问题补充： |
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2013-05-23 12:21:38
Fire resistance rating of two, the design life of 50 years.
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2013-05-23 12:23:18
fire-rated level 2 is designed for a use period of 50 years.
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2013-05-23 12:24:58
The fireproof rank is two levels, the design service life is 50 years.
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2013-05-23 12:26:38
Fire resistance rating for the second level, the design life span of 50 years.
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2013-05-23 12:28:18
fire-rated for class 2, design life of 50 years. ;
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