The construction of data base system is the important part of system development.
数据库系统的建设是系统开发的重要组成部分。
Meanwhile has provided the material base for the fourth part of development research study recommendation.
同时为第四部分的开展研究性学习的建议提供了物质基础。
Some key technologies of the founding of 3d CAD model are advanced on the base of the practicing design experience on the development of the system in the third part.
第三部分根据系统开发的实际设计经验，提出了建立三维CAD模型的一些关键技术。
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