【单选题】【消耗次数：1】
严先生，60岁。慢性阻塞性肺疾病，呼吸困难明显。血气分析：PaO240mmHg，PaCO270mmHg。正确的诊断
①
急性呼吸衰竭
②
慢性呼吸衰竭
③
Ⅰ型呼吸衰竭
④
Ⅱ型呼吸衰竭
⑤
混合型呼吸衰
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