问题
单项选择题
通用高速钢是指加工一般金属材料用的高速钢，其常温硬度为（）。
A.250HBS
B.62～65HRC
C.50～55HRC
D.45～50HRC
答案
参考答案：B
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通用高速钢是指加工一般金属材料用的高速钢，其常温硬度为（）。
A.250HBS
B.62～65HRC
C.50～55HRC
D.45～50HRC
参考答案：B
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