A:Al2(SO4)3=2Al3++3SO42﹣
B:Na2SO4=Na++SO42﹣
C:Ca(NO3)2=Ca2++2(NO3)2﹣
D:Ba(OH)2=Ba2++OH2﹣
已知a∈R,i为虚数单位,若 a−i2+i 为实数,则a的值为____.
(C)
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