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
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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