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关注：1
2013-05-23 12:21
求翻译：was estimated assuming a 150 ppb concentration in the air, an exit concentration of 50 ppb, and a flow rate of 100 cfm across a是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
was estimated assuming a 150 ppb concentration in the air, an exit concentration of 50 ppb, and a flow rate of 100 cfm across a
问题补充： |
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