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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（1）处填（）

A、waterfallmodel

B、workflowreferencemodel

C、evolutionarymodel

D、spiralmodel

  • B

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