众所周知，所有的机械乃至电子产品，如飞机、火箭、卫星要想正常运转都离不开机电控制系统。系统一旦失灵，后果不堪设想。然而，这一系统中的关键元件——电接触元器件很容易因外部环境的腐蚀和震动、磨损等因素导致重大故障。例如，美国“挑战者号”机毁人亡的原因便是因一 As we all know, all mechanical and electronic products, such as aircraft, rockets, satellites can not be separated from the electromechanical control system in order to work properly. Once the system fails, the consequences could be disastrous. However, the key components in this system - electrical contact components can easily lead to major problems due to external environment corrosion and vibration, wear and other factors. For example, the cause of the plane crash in the U.S. Challenger was the one