大坝采用全断面碾压混凝土经济断面。
The overall RCC economic cross-section is designed for the dam.
型钢是一种轻型薄壁、翼缘与腹板垂直的经济断面型钢。
Type steels are a kind of light economic section shaped steel with the perpendicular among thin-walls, girths and web plates.
铝合金挤压特宽空心壁板型材是地铁、城市轨道交通车辆用经济断面型材。
Aluminum extruded hollow profile with super large section is a kind of high efficiency profile, which is used for subway and other railway vehicles.
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