某医院预约系统的部分需求为：患者可以查看医院发布的专家特长介绍及其就诊时间：系统记录患者信息，患者预约特定时间就诊。用 DFD 对其进行功能建模时，患者是（ ）；
- 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
按对于数据流图来说，患者属于外部实体；对于实体关系图来说，患者属于实体。
选项D的弱实体是指某些实体对于另一些实体有很强的依赖关系，即一个实体的存在必须以另一实体的存在为前提。如果题干改成“患者家属”，答案则是弱实体。
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