单项选择题

SPR锁铆工艺连接过程是()

A.夹紧-冲裁-扩张-冲铆
B.夹紧-冲铆-扩张-冲裁
C.扩张-夹紧-冲裁-冲铆
D.夹紧-扩张-冲铆-冲裁