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【单选题】
呼吸机相关性肺炎是通常指机械通气(生的获得性肺炎。A.
48h 后，48h 之内
B.
48h 之内，48h 后
C.
4h 后，48h 之内
D.
48h 之内，24h 后
E.
24h 后，24h 之内
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