单项选择题
A.Z=1B.Z=-1C.Z=0D.Z=2
A.2B.4C.8D.0
A.丨z+1丨>1/2B.丨z+1丨<1/2C.丨z丨>1/2D.丨z丨<1/2
A.Q(0)B.-Q(0)C.Q'(0)D.-Q'(0)
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