氨茶碱的安全有效血药浓度是A．1～4μg/mlB．4～5μg/mlC．6～15μg/

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问题单项选择题

氨茶碱的安全有效血药浓度是

A．1～4μg/ml
B．4～5μg/ml
C．6～15μg/ml
D．20～25μg/ml
E．以上都不是

答案

参考答案：E

选择题

(2013·高考山东卷)________I have to give a speech，I get extremely nervous before I start.

A．Whatever

B．Whenever

C．Whoever

D．However

单项选择题

For an activity，the optimistic，most likely and pessimistic estimates are 12，16 and 18 respectively．Which of the following statement is correct ？（）

A．There is 68.26% chance that the activity will be completed in 15 to 17 day

B．There is 95.44% chance that the activity will be completed in 15 to 17 day

C．There is 68.26% chance that the activity will be completed in 14.67 to 16.67 day

D．There is 93.73% chance that the activity will be completed in 15 to 17 day