单项选择题 女性，70岁，有慢性咳嗽、咳痰史30年，气急加重3d。血气分析：pH7.26，PaCO60mmHg，PaO57mmHg，HCO26mmol/L，有关酸碱失衡应诊断为（）

单项选择题 患者，男，68岁，有慢性支气管炎病史17余年，近3年出现呼吸困难，并呈进行性加重，胸部X线检查示：肺野透亮度增加，膈肌位置降低，心脏悬垂狭长，肺野周围血管纹理减少、纤细。此患者肺功能检查的结果可能为（）

单项选择题 A 68=year-old man,with chronic cough and sputum production for 17 years,had felt a progressive dyspnea slnce 3 years. His chest X-ray film showed overinflation of lungs and descended diaphragms. The peripheral vasculature of the lungs was diminished. Which dis-ease the patient suffered from most possibly（）