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關(guān)注：1
2013-05-23 12:21
求翻譯：耐火等級為二級，設(shè)計使用年限為50年。是什么意思？ 待解決
 懸賞分：1
- 離問題結(jié)束還有
耐火等級為二級，設(shè)計使用年限為50年。
問題補充： |
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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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