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【单选题】
患者,男性,28岁。幼时曾患百日咳。咳嗽、咳痰3个月,近日咳大量脓痰今日早晨突然咯血3口。一旦出现支气管扩张大咯血,患者最危险且最常 见的并发症是
A.
严重贫血
B.
休克
C.
窒息
D.
继发感染
E.
肺不张
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A.
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B.
相角差
C.
幅值差
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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.
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D.
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A.
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B.
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C.
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A.
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B.
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B.
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C.
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D.
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