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设复数z1=1+i,z2=2+bi,若为纯虚数,则实数b=A.-2B.2C.-1D.1
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设复数z
1=1+i,z
2=2+bi,若
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAxCAYAAADukUiUAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADZSURBVEhL7VVBDsQgCORl/Inv8Bme4lNmZbe1
6FpJLz00NTFpglOYUQbCxUUXz+MhAIMQgdpmaDmXgmAG2+JFGbw6Xc8dKpmAZIeuMnisKJgVi0ra
H2oG5yCtrOwiSTmQLJVPSGNCf5yqOEGhUJYL4LFRhOXTmKn2AuKl7bKO0j6i47q31HVe7MLft69H
kM5acozfQvp1vs35CpT3x9fb6NT5ikqbEW6XFBwxvzh39mDWOWBw9xxQM0iYSinAtB80qRmPU+wU
0Fu9QbeypoCvlCejOOVwfwN9AAdJcQYCKN6eAAAAAElFTkSuQmCC
)
为纯虚数,则实数b=( )
A.-2
B.2
C.-1
D.1
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