Two instances suitable to combining-classes model is given, and conclude general mathematical form suitable to the combining-classes model, this form is named the crossed classification.
文章中给出了两个适用于合班模型的其它例子，在此基础上归纳出适用于合班模型的一般数学模式，称之为交叉分类问题。
Two instances suitable to combining-classes model is given, and conclude general mathematical form suitable to the combining-classes model, this form is named the crossed classification.
文章中给出了两个适用于合班模型的其它例子，在此基础上归纳出适用于合班模型的一般数学模式，称之为交叉分类问题。
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