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【单选题】
男72岁，咳嗽、咳痰30年，加重伴气短10天企体：神志清楚，口唇发钳，桶状胸，双肺少许干湿性啰音。胸部X线片示双肺纹理增粗，絮乱。血气分析示：PaO 55mmHg，PaCO ，39mmHg。该患者发生呼衰的机制是
A.
肺内分流
B.
弥散功能障碍
C.
肺通气不足
D.
氧耗量增加
E.
通气／血流比例失调
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