2009 Guangdong Question 2 Single-choice Differentiating 2009_省自主命题(广东) 2.下列n的取值中,使$i^n=1$(i是虚数单位)的是 A. $n=2$B. $n=3$C. $n=4$D. $n=5$ Answer keyC ☆ SaveCan't do it, show the explanation查看原卷 →