当采用数据流图对一个图书馆管理系统进行分析时，（ ）是一个外部实体。
- A.读者
- B.图书
- C.借书证
- D.借阅
正确答案及解析
正确答案
解析
在结构化分析中,数据流图用来记录系统中的数据和数据在特定的过程中的流动，即数据如何被采集、处理、保存和使用的（围绕信息系统的功能）。外部实体指系统之外又与系统有联系的人或事物。它表达了该系统数据的外部来源和去处。
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