A.1个 B.2个 C.3个 D.4个
A.25mm B.30mm C.40mm D.50mm
A.受压区混凝土先被压碎 B.受拉钢筋先达到屈服强度 C.受压钢筋先达到屈服强度 D.属于脆性破坏
A.3.5 B.2.5 C.1.5 D.0.7
A.0.5% B.1.0% C.1.5% D.2.0%