男性，12岁，低热、咳嗽、咽部不适1周，胸X线片示两肺下部网状及按小叶分布的斑片状浸润阴影，血WBC10×10⁹/L。

患者最可能的诊断是（）.

A.支原体肺炎

B.病毒性肺炎

C.军团菌肺炎

D.肺炎球菌肺炎

E.浸润型肺结核

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.