材料的进步促进了结构的发展。以钢和钢筋混凝土为材料的框架结构的大量应用是现代建筑技术发展中的一项重要成果,在( )结构中,由于墙体不承重,因而内部空间可以灵活分隔,开窗比较自由。
A.剪力墙
B.框架
C.钢
D.砖混
正确答案是B
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