单项选择题
A.球化退火 B.正火 C.淬火 D.回火
A.10°~15° B.5°~10° C.2°~5° D.1°~1.5°
A.5°~10° B.10°~12° C.12°~25° D.25°~30°
A.1~2 B.1/2~1 C.1/6~1/3 D.1/8~1/6
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