在维修工作中，经常碰到到时有时无故障。这些故障有些有规律可循，有些却找不到一些规律，你根本不知道它什么时候出现，什么时候消失，这对用户和维修人员都出了难题，对中小型医院来说，财力有限，大型设备如Ｘ光机、Ｂ超、ＣＴ等，就那么一两台，坏了就不能开展工作。在故 In the maintenance work, there is sometimes no trouble when it is often encountered. Some of these failures have regular patterns, some can’t find some rules, you don’t even know when it will appear, and when it disappears, it’s a problem for users and maintenance personnel. For small and medium-sized hospitals, financial resources are limited. Large-scale equipment such as X-ray machines, B-ultrasound, CT, etc., is only one or two, and if it is broken, it cannot work. In the