问题
单项选择题
One tool that is useful during both analysis and design is the （）,which is a pictorial representation of the items of information(entities) within the system and the relationships between these pieces of information.
A.data dictionary
B.dataflow diagram
C.use case diagram
D.entity-relation ship diagram
答案
参考答案：D
解析：在系统分析和设计中同样适用的工具是答案D实体关系图，它通过图形形式，表现系统内的实体信息以及这些信息之间的关系。