最近美国开发了一项新技术:利用海水制造建筑材料。美国得克萨斯州立大学的希贝尔教授发现,许多长期浸泡在海水中的金属器材表面都附有一层厚厚的类似石灰的东西。这一发现启发希贝尔教授进行了下面一项有趣的实验:他首先用铁丝网制成一个圆筒,圆筒内放置一个铅管,再将铁丝网作为阴极,铅管作为阳极,接上电压10～100伏的电流后,把这套装置放 Recently, the United States has developed a new technology: the use of seawater for building materials. Professor Hilbert at Texas State University in the United States has discovered that many metal surfaces that have long been immersed in seawater are accompanied by a thick layer of lime-like material. This discovery inspired Professor Sibel to carry out the following interesting experiment: he first made a cylinder with a wire mesh, placed a lead pipe inside the cylinder, and then used the wire mesh as a cathode, the lead pipe as an anode, and connected the voltage to 10~. After 100 volts of current, put the device