A.鑄鐵 B.合金鑄鐵 C.鋼板 D.鋁
A.0.8-1.2 B.0.7-1.0 C.0.4-0.7 D.0.8-1.0
A.0.2-0.3 B.0.01-0.015 C.0.03-0.04 D.0.4-0.7