A.振痕B.絲痕C.深凹痕D.扎刀
A.(0.75~0.80)×彈簧內(nèi)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(diào)質(zhì)