单项选择题
A.框架柱 B.预制混凝土顶板 C.现浇混凝土顶板 D.过梁
A.Roofing construction B.Cast concrete top plate C.The window D.The reduction
A.The door B.Cast concrete top plate C.The window D.The reduction
A.门 B.床 C.窗 D.地面
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