女，50岁，因急性腹膜炎住院。人院时腹痛，体温39.5^，脉搏108次/分，呼吸23次/分，血压80/50mmHg。呼吸时呼出气有烂苹果味。血气分析示. .血pH为7.23，PaC02为40mmHg，HC03_为12mmol/L。则该病人酸碱平衡失调的类型是

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