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【单选题】
单选题-某催眠药的消除速率常数为0.7h-1,设静脉注射后病人入睡时血药浓度为4mg/L,当病人醒转时血药浓度是0.25mg/L,问病人大约睡了多久?A.
3h
B.
4h
C.
8h
D.
9h
E.
10h
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反馈参考答案：
举一反三
【单选题】The amount of added utility that an individual derives from consuming one more unit of a good or service is called:
A.
total utility.
B.
marginal utility.
C.
average utility.
D.
diminishing utility.
【简答题】The strength of an Americano varies with the number of _______ and the amount of water added.
【判断题】In preparing bank reconciliation, the amount of outstanding checks is added to the balance per bank statement.()
A.
正确
B.
错误
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