1·Taking two examples, matching spatial features and their attributes and deleting reduplicate features in spatial database, indicate the technique key point of this appro.
分别以空间要素与其属性挂接和删除重复要素为例，来说明该方法的技术要点。
2·The structure of knowledge base is build by the database of relational data model. In order to add rules and delete reduplicate rules, knowledge base has the function of addition, deletion and so on.
本文采用了基于规则的知识表示方法，并采用了关系型数据库建立本系统的知识库，知识库具有添加、删除等功能，实现规则的增加及重复规则的删除。
1·In a three dimensional X ray coded imaging system, it is effective method to reduce the reduplicate noise of a certain layer image for enhancing the signal noise rate.
x射线编码三维成像系统中，减少观察层上的重叠噪声是提高图像信噪比的有效方法。