A.0.25-0.35 B.0.4-0.5 C.0.6-0.8 D.0.85-0.9
A.50-100mm B.100-150mm C.200-250mm D.250-360mm
A.高碳鋼 B.中碳鋼 C.低碳鋼 D.鑄鋼