Suffice it to say that the fresh air required to control pollution levels in a tunnel increases erratically with vehicle speed and traffic density and the design year is important.
这足以说明，由于车辆速度及交通密度的影响，用于控制隧道中污染水平的所需新鲜空气会不规则的增长，且设计年也很重要。
The tests were carried out in a constant volume tunnel in which the flow velocity, the environmental density and its temperature can be changed.
试验在专门研制的可变流场速度、可变环境密度和可变环境温度的定容风洞中进行。
The paper is based upon Aero-Optics theory, pursuing the methods and realization for measuring the density distribution of transient flow field in wind tunnel test.
本论文基于气动光学理论，研究在流场试验中检测高速瞬态流场密度分布的方法与实现。
Moire tomography is applied to measure the complex density distribution in supersonic wind tunnel.
使用叠栅层析技术解决超音速风洞中复杂密度场的测量难题。
The paper introduces method, technique and application effect of high density resistivity method in exploration laws of recharge, runoff, drainage of tunnel water burst.
该文主要介绍了应用高密度电法，在勘察隧洞涌水，寻找涌水的补给、径流、排泄规律时的方法技术及应用效果。
Before charging and blasting in gas tunnel, safety inspection must be done to ensure the gas density less than 1%.
瓦斯隧道装药爆破前必须进行安全检查，确保瓦斯浓度小于1%。
Before charging and blasting in gas tunnel, safety inspection must be done to ensure the gas density less than 1%.
瓦斯隧道装药爆破前必须进行安全检查，确保瓦斯浓度小于1%。
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