单项选择题
A.淬火 B.退火 C.热处理 D.回火
A.<0.03% B.<0.08% C.≦0.0218% D.≦0.25%
A.<0.08% B.<0.0218% C.≦0.25% D.≦0.02%
A.5% B.10% C.12% D.15%
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