large-scale steel structure 基本例句 大型钢结构 It is one of the largest steel structure's productive base of north china with an annual output of steel structure over 20,000 tons and colorful metal constringent plate500,000m2.年生产钢结构两万吨，彩色金属压型板五十万平方米，为中国北方大型钢结构生产基地。