Now, this system is called Evacuated Tube Transportation (ETT), which monishes the air resistance of rail transit, but it essentially belongs to the category of rail transit all the same.
真空管道系统就是在现有的轨道交通基础上减小了空气阻力，其本质还是属于轨道交通的范畴。
Flue gas-air tube heat exchanger is designed and made, its test-bed system is put up, and the thermal property and resistance characteristic of air side are studied.
设计并制作了管式烟气-空气热交换器，搭建了试验台系统，进行热工性能和空气侧阻力特性的研究。
The fire resistance behaviour and design of CFST columns are one of the key issues in practice due to the steel tube being exposed to air.
因钢管外露，钢管混凝土柱的抗火性能与设计是其在工程实践中的关键问题之一。
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