题目详情

以下关于数据流图的基本要素的叙述中,不正确的是(  )。

  • A.外部实体仅指软件系统的用户
  • B.数据流由一组固定成分的数据组成,表示数据的流向
  • C.加工用于描述输入数据流到输出数据流之间的变换
  • D.数据存储用来表示存储的数据

正确答案及解析

正确答案
A
解析

数据流:由一个或一组固定的数据项组成,表示数据的流向。

加工:描述了输入数据流到输出数据流之间的变换,也就是输入数据流经过什么处理后变成了输出数据流。

数据存储:数据存储用来存储数据。

外部实体:是指在于软件系统之外的人员或组织,其指出系统所需数据的发源地(源)和系统所产生的数据的归宿地(宿)。

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