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【题目】下列说法正确的是

A.如果两个复数的实部的差和虚部的差都等于0,那么这两个复数相等

B.ai是纯虚数aR

C.如果复数x+yix、yR是实数,则x=0,y=0

D.复数a+bia、bR不是实数

答案A

解析两个复数相等的充要条件是这两个复数的实部与虚部分别相等,即它们的实部的差与虚部的差都为0,故A正确;B中当a=0时,ai是实数0;Cx+yi是实数,只需y=0就可以了;D中当b=0时,复数a+bi为实数.

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