A.1/1000 B.1/800 C.1/1500 D.1/2000
A.屈服变形 B.拉伸破坏 C.脆性破坏 D.塑性破坏
A.增大; B.减小; C.不变
A.12.5% B.40% C.15% D.25%
A.8 B.6 C.4 D.3
A.柔性钢索 B.刚性拉杆
A.1 B.3 C.6 D.12