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【单选题】
成人呼吸窘迫综合征急性阶段的主要病理变化(  )
A.
各种炎症细胞浸润使肺泡间隔增厚
B.
肺泡腔，肺泡管内液体机化
C.
肺间质水肿，肺泡水肿
D.
Ⅱ型肺泡上皮细胞增生
E.
肺纤维化形成
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