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题目： 单选以下哪项是维持酸碱平衡最重要的系统（）
A . 肾素.血管紧张素-醛固酮系统
B . 神经调节
C . HCO
/H2CO3
D . 肾调节
E . 肺的呼出作用答案不对？请尝试站内搜索
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