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当前学科：模具制造工艺学
题目：
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基体钢是一种高强韧性的冷作模具钢，它是在下列哪类钢种基础上适当调整合金成分而开发的（）。
A . 碳素工具钢
B . 合金结构钢
C . 高速钢
D . 碳素结构钢
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