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【单选题】
某催眠药的半衰期为2小时,给予100mg药物后入睡,当患者体内剩下12.5mg 时清醒过来,这位患者睡了A.
2小时
B.
4小时
C.
6小时
D.
8小时
E.
10小时
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A.
intention
B.
extention
C.
extend
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A.
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which
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A.
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A.
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B.
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C.
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D.
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A.
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in that
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