单项选择题

A.划线→锯割→锉削→倒角→钻孔→弯折
B.划线→锯割→锉削→钻孔→倒角→弯折
C.划线→弯折→锯割→锉削→钻孔→倒角
D.钻孔→倒角→锯割→锉削→钻孔→弯折