胃十二指肠消化性溃疡穿孔最好发部位是（）

A.十二指肠球部前壁

B.十二指肠球部后壁

C.胃小弯

D.胃大弯

E.胃底

What is the WBS typically used for

A．To organize and define the total scope of the projec

B．To identify the logical person to be project sponso

C．To define the level of reporting the seller provides the buye

D．As a record of when work elements are assigned to individual