[题目]下列关于合金的叙述中正确的是( )A. 合金是由两种或多种金属熔合而成的B. 日常生活中用到的五角硬币属于铜合金C. 合金在任何情况都比单一金属性能优良D. 低碳钢比中碳钢强度高题目和参考答案——青夏教育精英家教网—

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【题目】下列关于合金的叙述中正确的是( )

A. 合金是由两种或多种金属熔合而成的

B. 日常生活中用到的五角硬币属于铜合金

C. 合金在任何情况都比单一金属性能优良

D. 低碳钢比中碳钢强度高

【答案】B

【解析】合金是金属与金属或金属与非金属熔合而成的，A项错误；合金的性能一般比单一金属性能优良，但并不是任何情况都是，如纯铝的导电性比铝合金要好，C项错误；含碳量高强度大，中碳钢比低碳钢强度高，D项错误。

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