最早开发的贵金属黄金是人类历史上最早被开发和使用的一种贵金属。由于黄金具有美丽的金属光泽、优良的导电性、极好的抗腐蚀性能、在低温和高温时不氧化,而且不溶于单一的酸和碱溶液中。由于它的化学性质非常稳定,长期以来,黄金主要用于制作首饰、货币、镶牙、陶瓷、金笔等领域。但在第二次世界大战以来,由于尖端科学技术和黄金合金技术的迅猛发 The earliest developed precious metal gold is the earliest human history has been developed and used as a precious metal. Because gold has a beautiful metallic luster, excellent electrical conductivity, excellent corrosion resistance, low temperature and high temperature does not oxidize, and do not dissolve in a single acid and alkali solution. Because of its very stable chemical properties, gold has long been used mainly for the production of jewelry, currency, denture, ceramics, gold pen and other fields. However, since the Second World War, due to the rapid development of cutting-edge science and technology and gold alloy technology