A.時(shí)效敏感性 B.藍(lán)脆 C.白點(diǎn) D.夾雜
A.0.08~0.12% B.0.12~0.17% C.0.15~0.19% D.0.16~0.22%
A.0.01% B.0.02% C.0.03% D.0.04%