单项选择题

A.下限为5.0mmol/L,上限为6.0mmol/L
B.下限为4.0mmol/L,上限为7.0mmol/L
C.下限为4.5mmol/L,上限为6.5mmol/L
D.下限为4.0mmol/L,上限为6.5mmol/L
E.下限为3.5mmol/L,上限为7.5mmol/L