2011 Hunan Question 2 Single-choice Differentiating 2011_退役省自主命题 (2011·理) 1.若 ,a b RÎ,i为虚数单位,且( )$a i i b i+ = +$,则( ) A. $1, 1a b= =$B. $1, 1a b= - =$C. $1, 1a b= - = -$D. $1, 1a b= = -$ Answer keyD ☆ SaveCan't do it, show the explanation查看原卷 →