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问题 选择题

I hear that he will be back _______ two weeks' time. [ ]

A. at

B. in

C. after

D. for

答案

答案：B

单项选择题

阿胶最常用的炮制方法是

A．滑石粉炒法

B．蛤粉炒法

C．麦麸煨法

D．烘焙法

E．煮法
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单项选择题

The expected time TE used in the PERT algorithm is calculated using the following equation ______.

A) (a+3m+b)/6
B) (a+4m+b))/6
C) (a+5m+b)/6
D) (a+m+b)/3
Note: A major assumption for all network methods is that activity durations are statistically dependent and where a=most optimistic time, b=most pessimistic time, m=most likely time.
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