氧是O，氧气是O2 ··· 它们有什么区别 - 百度知道
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氧是O，氧气是O2 ··· 它们有什么区别区别1、性质不同氧只是一种元素；氧气是一种纯净物2、组成不同氧是一种元素,氧气是由氧元素组成的.3、代表不同单独的O可以代表氧元素,也可以代表一个氧原子.O2可以代表氧气这
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