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【单选题】
医院获得性肺炎的特点是A.
在入院前感染，入院时患者处于潜伏期
B.
患者入院后48小时内发病
C.
发病机制是误吸口咽部定植菌
D.
肺炎链球菌是其最常见的病原体
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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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C.
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D.
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