某慢性肾功能不全患者因上腹部不适、呕吐 而人急诊室，血气分析及电解质测定结果如下：pH 7.40，PB. (X)^ 5. 90B. PB.  ( 44mmHg), HC. QT 26nunol/L* NB. + 142mmol/L,C. l" 96mmol/Le该患者属于哪种酸碱平衡紊乱

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