研究了半环的粗糙子半环和粗糙理想的性质；
The paper suggests the properties of rough subsemirings and rough ideal.
分析了基于粗糙集理论的知识粗糙性的产生、性质及实质；
So, Rough Set Theory has provided the frame for knowledge roughness research.
分析了基于粗糙集理论的知识粗糙性的产生、性质及实质；
So, Rough Set Theory has provided the frame for knowledge roughness research.
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