单选题:有关下列化学常识说法有误的是(  )。

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题目内容:
有关下列化学常识说法有误的是(  )。 A.相对分子质量最小的氧化物是水
B.熔点最小的金属是汞
C.导电性最强的金属是银
D.组成化合物种类最多的元素是氧
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