测试结果表明：双层集装箱车辆进入隧道口时，空气压差阻力急剧上升，之后又迅速回落；
Results indicate that when the double container car enters into a tunnel, the pressure drag of the double container car quickly rises, and then rapidly falls.
但是即使没有温差的存在，空气还是会有高低气压差。
But high and low air pressure differences exist even outside of temperature differences.
并利用自行组装的测试设备研究了柔性石墨板密度、厚度以及空气压力差对相对透气系数的影响。
We also assemble a set of permeability testing equipment, by which we study on the effect of density, thickness and air pressure on the relative permeability.
主要产品是与冷冻机，冷却机，加热机，空气压缩机及空调器配套的各种不同系列的压力控制器，压差控制器，流量开关。
The main products are Freezer, Cooler, Heat-up Machine, Air-Compressor, Air-conditioning Epuipment and other Various complete series of Pressure Controls, Pressure Differential Controls, Flow Switch.
有些矿井利用大气压力差引起空气自然流动，有些矿井则必须用扇风机把空气压人井内。
In some cases the difference in atmospheric pressure causes the air to circulate naturally; in others a fan must be used to pump air into the mine.
有些矿井利用大气压力差引起空气自然流动，有些矿井则必须用扇风机把空气压人井内。
In some cases the difference in atmospheric pressure causes the air to circulate naturally; in others a fan must be used to pump air into the mine.
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