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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
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jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAOVJREFU
SEvtVcENwzAIpCuzDpswB1N4CWpSxwE3MfKjVR6xZCkSvpg7w/HSumBlGWBlwcrhLZtbAkQJwJRq
G5XLdaKgIiotXhgVZ6cDaSEF2qGzGyxWWBFZJ5n0P1RZjQP1tDKZgdGRLJWPu0YIvjhZFR0KubRM
AIuNIkxf+ky1B+AfbZd1lPaeDZSVW4zHWgqd57vw831f11gkvXb8T1b5OF9zvqKMe/FFGz11vsLU
Z4TZJThHzFvUnN2ZdQ4Y3D0H1BvITaUUIBwHTWrG4xS7BESrF+WW1ilgk/JiFKccxgb7PeANxJpb
IaisLbQAAAAASUVORK5CYII=
)
为纯虚数,则实数b=( )
A.-2
B.2
C.-1
D.1
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