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【单选题】
药物的血浆半衰期是指A.
药物被机体吸收一半所需的时间
B.
药物效应在体内减弱一半所需的时间
C.
药物与血浆蛋白结合一半所需的时间
D.
药物在体内消除一半所需的时间
E.
药物在血浆的浓度下降一半所需的时间
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