题目内容 (请给出正确答案)
提问人:网友f******g 发布时间:2022年6月12日 23:45
[ 单项选择题]

淬火钢在回火时,随回火温度的升高,钢的硬度不断()。

A.下降

B.上升

C.先升后降

D.先降后升

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