【单选题】【消耗次数：1】
如果两个概念的外延完全不同，而且它们外延之和等于其属概念的外延，则这两个概念的关系为？（ ）.
①
矛盾关系
②
交叉关系
③
属种关系
④
反对关系
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如果两个概念之间，一个概念的外延完全包含在另一个概念的外延之中，而且仅仅成为另一个概念外延的一部分，则这两个概念之间的关系是（ ）.
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