A.軸承鋼 B.滲碳軸承鋼 C.塑鋼 D.中碳鋼
A.軸承鋼 B.工程塑料 C.塑鋼 D.中碳鋼
A.0.025~0.508mm B.0.025~0.54mm C.0.025~0.58mm D.0.075~0.54mm