单项选择题

弱酸性药物的Henderson-Hasselbalch表达公式为( )

A.pKa-pH=logCm/Ci
B.pKa-pH=logCi/Cm
C.pH-pKa=logCm/Ci
D.pKa-pH=logCm/Ci
E.pKa+pH=logCi/Cm
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