【題目】下列說法正確的是( )

A. 所有不銹鋼都只含有金屬元素

B. 我國流通的硬幣材質(zhì)是金屬單質(zhì)

C. 廣東正在打撈的明代沉船上存在大量鋁制餐具

D. 鎂合金的硬度和強(qiáng)度均高于純鎂

【答案】D

【解析】A項(xiàng)，不銹鋼亦含有碳元素，為非金屬元素；B項(xiàng)，我國流通的硬幣為合金，含有錫等金屬；C項(xiàng)，明代沒有發(fā)現(xiàn)冶煉鋁的方法，不可能有鋁制餐具；D項(xiàng)，合金的硬度和強(qiáng)度一般比其成分金屬的硬度和強(qiáng)度大。

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