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例1 A、B、C 是中学化学中常见的3种化合物,它们各由两种元素组成,甲、乙是两种单质。这些化合物和单质之间存在如下的关系:
Example 1 A, B, and C are three compounds commonly found in middle school chemistry. Each of them consists of two elements. A and B are two simple substances. The following relationship exists between these compounds and the simple substance: