4 单选The content of carbon of medium carbon steel is --?
A、A0.008wt%-0.25wt%;
B、B0.25wt%-0.60wt%;
C、C0.60wt%-2.14wt%;
D、D2.14wt%-6.70wt%
发布时间：2024-09-25 09:20:41
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