相关考题
-
单项选择题
T12钢碳的质量分数平均为()
A.0.12%
B.1.2%
C.12%
D.1%~2%
A.0.12%
B.1.2%
C.12%
D.1%~2%
微信扫一扫,加关注免费搜题