The economic cross section and economic ventilated velocity of shafts are the optimal matching result of civil engineering and equipment investments, operation and energy consumption.
通风井的经济断面积和经济风速是土建投资、设备投入和运营能耗的最优匹配结果。
参考来源 - 特长深埋隧道通风井经济断面积和经济风速研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Channel section steel is a kind of economic cross section steel, the products are widely used in automobile, aviation, light industry, machinery manufacture and construction areas.
槽钢是一种经济断面型材，广泛应用于汽车、航空、轻工、机械制造以及建筑等各个行业。
The paper proposed compute formula of digging pile panelling vertical cross section, introduced construction method and analysed economic benefit.
提出了挖孔桩护壁竖向截面积的计算公式，介绍了施工方法，分析了经济效益。
To use borehole variable cross section piles as deep foundation in soft soil district may acquire better economic benefit.
在软土地区使用钻孔变截面桩作为深基础可以取得较好的经济效益。
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