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【单选题】
下列关于弯曲件形状及弯曲工艺尺寸要求的有关表述正确的是 。A.
当弯曲件的结构不对称时，弯曲件结构改成对称结构，防止工件弯曲时产生偏移缺陷。
B.
弯曲件的弯曲半径尺寸可以小于最小相对弯曲半径；
C.
当弯曲件中有冲孔部位时，可以先冲孔定位，而后进行弯曲变形，且弯曲件直边高度不宜过大；
D.
对于弯曲件中的精度要求较，要先弯曲后冲，以保证的尺寸和位置精度。
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