['A. 钢材的韧性好', 'B. 钢材接近均质等向体,力学计算结果与实际结果最符合', 'C. 钢材的重量与强度之比小于混凝土等其他材料', 'D. 钢结构具有良好的装配性']
大跨度结构应优先选用钢结构,其主要原因是()
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