8个月男婴，因腹泻1周来急诊。大便初为5-6次/天，黄绿色，蛋花汤样便伴有黏液、发霉臭味，无里急后重，近2天大便每天10余次，伴呕吐1-2次/天，纳差，饮水少，尿少。测血钠125mmol/L,体重7kg,精神萎靡，皮肤弹性较差，前囟、眼窝明显凹陷，四肢稍凉。治疗后6小时有尿，入院20小时出现精神萎靡，心音低钝，腹胀，血钾3.2mmo1/L。补钾原则哪项不正确

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