某航空公司拟开发一个机票预订系统。旅客使用信用卡付款预订机票，付款通过信用卡公司的信用卡管理系统提供的接口实现。现拟用数据流图建立需求模型，则信用卡管理系统是（ ）。
- A.外部实体
- B.加工
- C.数据流
- D.数据存储
正确答案及解析
正确答案
解析
本题考查数据流图知识。
信用卡管理系统不属于本系统开发的部分，存在于软件系统之外的组织，用于数据接口实现，故属于外部实体，本题选A。
数据流图一般考查知识为下午题，通过典型的特征，可以很方便地去补充相关的知识。
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