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【单选题】
低钾血症是指血清钾浓度低于多少（）A.
5.0mmol/L
B.
4.5mmol/L
C.
4.0mmol/L
D.
3.5mmol/L
E.
3.0mmol/L
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A.
easy
B.
high
C.
accessible
D.
acceptable
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A.
access
B.
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C.
accent
D.
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