A.0.0218%~2.11% B.0.0218%~0.77% C.0.20%~0.60% D.0.60%~0.80%
A.低溫回火 B.高溫回火 C.中溫回火 D.低溫退火
A.生產(chǎn),管理 B.橫向,縱向 C.縱向,橫向 D.直接,間接