binary relation短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 二目关系,二元关系 Moreover, the characterization of core attributes, relative necessary attributes, unnecessary attributes were discussed based on decision maximum distribution binary relation. 并进一步分析了最大分布的核心属性、相对必要属性、不必要属性的相应的特征刻画。 joca