A:划线→锯割→锉削→冲眼→钻孔→孔口倒角→攻丝
B:划线→锯割→锉削→冲眼→钻孔
C:划线→冲眼→钻孔→锯割→锉削→孔口倒角→攻丝
D:划线→冲眼→钻孔→锯割→锉削
若(2x﹣4)2+(x+y)2+|4z﹣y|=0,则x+y+z等于( )