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    【题目】下列说法不正确的是

    A．钢是铁合金，钢的含碳量低于生铁，性能优于生铁

    B．金属具有的物理通性是具有良好的延展性、导热性、导电性，并有银白色光泽

    C．符号Al既能表示铝元素，又能表示一个铝原子，还能表示铝单质

    D．焊锡是锡铅合金，把铅加入锡中制成合金的主要目的是降低熔点

    【答案】B

    【解析】A．钢的含碳量是：0.03%~2%，生铁的含碳量是：2%~4.3%。钢的性能优于生铁，正确；B．金属具有的物理通性是具有导电性、延展性、导热性、大多数是银白色光泽的物质，Cu是红色，Au是黄色金属，错误；C．符号Al是铝元素的元素符号，既能表示铝元素，又能表示一个铝原子，还能表示铝单质，正确；D．合金的特性之一是合金的熔点一般要比其组分低，焊锡的熔点要低于锡和铅，所以在焊接金属时，为节约时间，节约能源、节约成本采用锡铅合金，所以焊锡是锡铅合金，把铅加入锡中制成合金的主要目的是降低熔点，正确。

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