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【单选题】
现要在左图所示的三维模型的基础上创建一个特征,得到右图所示结果。请问新创建的这个特征是什么特征?
A.
Pocket（挖空）
B.
Draft（拔模）
C.
Multi-Sections solid（多截面实体）
D.
Chamfer（倒角）
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