题目内容

【题目】下列说法正确的是( )

A. 所有不锈钢都只含有金属元素

B. 我国流通的硬币材质是金属单质

C. 广东正在打捞的明代沉船上存在大量铝制餐具

D. 镁合金的硬度和强度均高于纯镁

【答案】D

【解析】A项，不锈钢亦含有碳元素，为非金属元素；B项，我国流通的硬币为合金，含有锡等金属；C项，明代没有发现冶炼铝的方法，不可能有铝制餐具；D项，合金的硬度和强度一般比其成分金属的硬度和强度大。

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