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.
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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