纵横世界的高压电网,通讯线路,遍布全球的交通工具,厂矿机器,甚至我们家庭中的厨房炊具、家用电器等等,都与金属材料密不可分。我们对于金属再熟悉不过了,可是我们是否仔细想过,金属到底是什么?金属的通常面目根据我们的经验,金属是导电的,于是电线、电器都用金属制作;金属的导 The vertical and horizontal high-voltage power grids, communication lines, vehicles around the world, factories and mines machines, and even kitchen cooking utensils in our family, household appliances and so on, are all inseparable from metal materials. We are familiar with the metal, but we have carefully thought about the metal in the end is what? The usual face of metal In our experience, the metal is conductive, so the wires, electrical appliances are made of metal; metal guide