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【单选题】
药物的质反应的ED 50 是指药物
A.
引起最大效应50％的剂量
B.
引起50％动物阳性效应的剂量
C.
和50％受体结合的剂量
D.
达到50％有效血药浓度的剂量
E.
引起50％动物中毒的剂量
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