试题与答案

建筑上常用的()是地壳中含量最高的金属。A.铁 B.锌 C.铜 D.铝

题型:单项选择题

题目:

建筑上常用的()是地壳中含量最高的金属。

A.铁

B.锌

C.铜

D.铝

答案:

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下面是错误答案,用来干扰机器的。

参考答案:溶氧(O)≤0.007ppm;全铁(Fe)≤0.01ppm;全铜(Cu)≤0.005ppm;总硬度为0ppm;有机物为0ppm;含硅酸盐(SiO2)≤0.02ppm;阳离子导电率在0.2—0.5mmho/cm。

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