单选题:完全退火是将钢件加热到(  )(对亚共析钢而言,是指珠光体全部转变为奥氏体、过剩相铁素体也完全消失的温度)以上适当温度,

题目内容:
完全退火是将钢件加热到(  )(对亚共析钢而言,是指珠光体全部转变为奥氏体、过剩相铁素体也完全消失的温度)以上适当温度,在炉内保温缓慢冷却的工艺方法。 A.临界点AC3
B.临界点AC1
C.临界点ACM
D.临界点A3
参考答案:
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