试题与答案

中碳钢的含碳量为()。A、0.2%~0.3% B、0.25%~0.6% C、0.5%

题型:单项选择题

题目:

中碳钢的含碳量为()。

A、0.2%~0.3%

B、0.25%~0.6%

C、0.5%~0.8%

D、0.6%~0.7%

答案:

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