The (29) is a general description of the architecture of a workflow management system used by the WFMC, in which the main components and the associated interfaces are summarized. The workflow enactment service is the heart of a workflow system which consists of several (30) 。

30（）

A. workflow engines

B. processes

C. workflow threads

D. tasks

组织结构的宽度，是指组织（）的程度。

A.集权化和分权化

B.民主与集中

C.职责与权力

D.任务的分配