(单选题)14: pKa是指
A: 弱酸性、弱碱性药物达到50%最大效应的血药浓度的负对数
B: 弱酸性、弱碱性药物呈50%解离时溶液的pH值
C: 药物解离常数的负倒数
D: 激动剂增加一倍时所需的拮抗剂的对数浓度
E: 药物消除速率
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