单项选择题
A.45 B.65Mn C.08F D.304
A.冷脆 B.热脆 C.氢脆
A.0.0218%~2.11% B.0.0218%~0.77% C.0.20%~0.60% D.0.60%~0.80%
A.低温回火 B.高温回火 C.中温回火 D.低温退火
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