The creation of a work breakdown structure (WBS) is the process of（）the major project deliverables.

A.subdividing

B.assessing

C.planning

D.integrating

关节受伤后出现关节囊空虚，畸形，请指出最可能原因（）

A.关节囊破裂

B.关节内骨折

C.关节面失去对合关系

D.关节内血肿

E.关节功能丧失