单项选择题
A.500-1000mg/LB.1000-1500mg/LC.1500-2000mg/LD.2000-2500mg/L
A.0.1mmol/lB.0.15mmol/lC.0.2mmol/lD.0.25mmol/l
A.0.2mmol/lB.0.3mmol/lC.0.4mmol/lD.0.5mmol/l