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【单选题】
女性，75岁。慢性咳喘20余年，近3年伴有双下肢水肿，5天来咳喘加重，应用抗生素、利尿剂，效果不著，1天来失眠、烦躁。血气分析：pH7.35，PaO 2 55mmHg，PaCO 2 74mmHg，AB42mmol/L，血氯80mmol/L。该患者可能的诊断为（ ）A.
代谢性酸中毒失代偿
B.
呼吸性酸中毒失代偿
C.
呼吸性酸中毒伴代谢性酸中毒
D.
呼吸性酸中毒伴代谢性碱中毒
E.
呼吸性酸中毒代偿
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