Stochastic comparison between a system of used components and a used system is developed. Cases ofresidual life and inactivity time are investigated independently. Some applications are given as well.

• 研究了旧元件组成的系统与旧系统之间的随机比较；对于剩余寿命和休止时间情形分别进行了讨论；并且给出了一些应用.