A.30°~50° B.50°~60° C.60°~70° D.70°~80°
A.20% B.25% C.30% D.50%
A.8 B.18 C.20 D.28
A.拉断和弯曲 B.拉断和扭转 C.弯曲和扭转 D.拉断
A.0.5 B.1 C.1.5 D.2