Men in suits watch an experimental smog-control device on a smokestack in 1948.
1948年，这些西装笔挺的人们正在观看一台利用烟囱调节烟雾的实验性设备。
Cost for operation ventilation, operation safety, smog exhaust during a fire and its control and other key problems are well addressed.
在满足通风要求的基础上，重点研究了通风运营成本及运营安全、火灾排烟及火灾通风控制等关键问题。
Now scientists warn that if not under control, the unseen energy waves, "electric smog", may be hazardous to our health.
现在科学家警告说，有一种肉眼看不到的能波，即“电子烟尘”，如果不加以控制，可能危害人类的健康。本文永久地址。
Also the attentions in application of CO2 fire system, new fire extinguishing agent FM-200 and smog control are presented.
并介绍CO2气体灭火系统，新型灭火剂FM- 200和烟烙尽在应用中应注意的一些问题。
The results showed that the urea malic acid treatment can significantly reduce the tar content in smoke smog by 16.9% based on the control treatment.
结果表明，苹果酸脲处理能明显减少烟气中焦油含量，减少量占对照处理的16.9%。
The results showed that the urea malic acid treatment can significantly reduce the tar content in smoke smog by 16.9% based on the control treatment.
结果表明，苹果酸脲处理能明显减少烟气中焦油含量，减少量占对照处理的16.9%。
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