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若纯虚数z满足(2-i)z=4-bi,(i是虚数单位,b是实数),则b=( ) ...
若纯虚数z满足(2-i)z=4-bi,(i是虚数单位,b是实数),则b=( )
A.-2
B.2
C.-8
D.8
考点分析:
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