单项选择题
The (1) 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 (2).
空白（2）处填（）
A.workflow engines B.processes C.workflow threads D.tasks
单项选择题 空白（1）处填（）
单项选择题 空白（3）处填（）
单项选择题 空白（2）处填（）
