不考虑某些旋转因子的特殊性,一般一个基2FFT算法的蝶形运算所需的复数乘法及复数加法次数分别为()。
A.1和2
B.1和1
C.2和1
D.2和2
参考答案:A
Who did the teacher______ an article for the wall newspaper?[ ]
A. has write
B. has written
C. have write
D. have written