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【单选题】
已知 . z 1+2i =2-i （ . z 是z的共轭复数），则复数z在复平面内对应的点位于（ ）A.
第一象限
B.
第二象限
C.
第三象限
D.
第四象限
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A.
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B.
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C.
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D.
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A.
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B.
such a so ．
C.
s，o a that
D.
such that
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