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【单选题】
小儿,10个月。患腹泻、脱水及代谢性酸中毒。补液治疗后以上症状均有好转,但患儿精神不振、腹胀,医生考虑为低钾血症,进行化验检查。血清钾低于以下何值即可出现缺钾症状A.
3mmol/L
B.
3.5mmol/L
C.
4mmol/L
D.
4.5mmol/L
E.
5mmol/L
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