请指出低碳钢、中碳钢和高碳钢的碳含量范围，指出一些它们应用的实例。
Point out the range of carbon content of low-carbon steel, medium-carbon steel and high-carbon steel. Give some examples for their applications.
在小范围内中碳钢和紫铜电偶对的距离远近对电位分布影响不大。
The distance of the galvanic couples is not a key factor influencing potential distribution in small range.
在小范围内中碳钢和紫铜电偶对的距离远近对电位分布影响不大。
The distance of the galvanic couples is not a key factor influencing potential distribution in small range.
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