朱先生，20岁，破伤风患者，抽搐频繁，引起肘关节脱位，呼吸道分泌物多，此时首先应采取的措施是（）

A.脱位整复

B.止痛

C.气管切开

D.快速应用TAT

E.给大量青霉素

In order to compute the probability of completing a project on time, the standard deviations (SD) of each activity must be known. These can be calculated using the following expression ______.

A) SD=(b-a)/6
B) SD=b-a/6
C) SD=(a-b)/6
D) SD=(b-a)/12
Note: The definitions of a=most optimistic time and b=most pessimistic time. Use the following information for questions 10 and 11 for the following is duration data related to an activity in a time scale network.
Optimistic time=a=10 days
Pessimistic time=b=20 days
Most likely time=m=12 days