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【单选题】
以下关于刃口尺寸计算公式及说法正确的是 。
A.
计算模具刃口中心距表达式为：
B.
当凸、凹模采用分别加工时，落料凹模刃口计算公式为
C.
当凸、凹模采用分别加工时，冲凹模刃口计算公式为
D.
当凸、凹模采用分别加工时，落料凸模刃口计算公式为
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