问题
单项选择题
截面较大,形状复杂、工作条件繁重的各种冷冲模用()。
A.T12A
B.Cr12
C.Cr12MoV
D.9Mn2V
答案
参考答案:C
截面较大,形状复杂、工作条件繁重的各种冷冲模用()。
A.T12A
B.Cr12
C.Cr12MoV
D.9Mn2V
参考答案:C
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