1岁患儿，因腹泻4天入院，考虑为轮状病毒性肠炎，查体：精神稍差，略有烦躁不安，皮肤稍干燥，弹性好，眼眶稍凹陷，尿量可，査电解质Na+125mmol/L。血气分析为：pH7.38,PC0232mmHg,HC03-lOmmol/L,BE-10mmol/L。该患儿酸中毒的原因可能为

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