A.(0.75~0.80)×彈簧內徑B.(0.75~0.80)×彈簧外徑C.(0.75~0.80)×彈簧中徑D.0.75×彈簧外徑
A.退火B.淬火C.回火D.調質
A.碳素結構鋼B.高速鋼C.碳素工具鋼D.40Cr