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【单选题】
给某病人服用一种催眠药,经测定其血浆浓度为16ug/ml,已知该药的半衰期为4小时,当病人醒过来时,血药浓度为2ug/ml。试问该病人大约睡了多长时间?A.
4小时
B.
8小时
C.
12小时
D.
16小时
E.
20小时
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