提出了一种基于粗集的缺省规则挖掘模型，以利于在信息不完备情况下进行推理和决策。
A rough set model to mine default rules was presented in order to reason and solve the decision question with incomplete information.
粗集是一种处理模糊和不确定性数据的工具，因而成为数据挖掘中的重要框架。
Rough Set is a tool to deal with vague and uncertain data, therefore it becomes an important frame in DM.
等价关系是粗集理论中的一个重要概念。
The equivalence relation is the basic Concept of the rough set theory.
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