就其性质而言，关系数据库比层次数据存储结构(如xml)更灵活。
Relational databases are, by their nature, more flexible than hierarchical data storage structures such as XML.
针对航空火控系统结构和检测的特点，设计了一种基于层次数据模型的航空火控系统检测数据库系统。
A test database system for the aeronautic fire control system based on hiberarchy is designed in allusion to the structure and the test characteristic of the aeronautic fire control system.
针对航空火控系统结构和检测的特点 ，设计了一种基于层次数据模型的航空火控系统检测数据库系统。
This paper makes a study of the application of Direct3D in development of air combat simulation system of airborne FCS (Fire Control System) and introduces the method of software development.
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