男性，40岁，体重60kg。因食管癌进食困 难月余，主诉：乏力、极度口渴、尿少而 色深。检查：血压、体温均正常，眼窝凹 陷、舌干燥、皮肤弹性差，补液后口渴减轻，尿量増多，测血清钾浓度为3 . 1mmol/ L，应在尿量达下列哪项指标时补给钾盐

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