试题与答案

铁碳合金中的含碳量逐渐增加到1%时，金属材料的强度、硬度（）。A、升高，塑性和韧性下

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题型：单项选择题

题目：

铁碳合金中的含碳量逐渐增加到1%时，金属材料的强度、硬度（）。

A、升高，塑性和韧性下降

B、升高，塑性和韧性升高

C、下降，塑性和韧性升高

D、下降，塑性和韧性下降

答案：

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参考答案：1 3

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