一台精密仪器的工作时间为 n 个时间单位。与仪器工作时间同步进行若干仪器维修程序。一旦启动维修程序，仪器必须进入维修程序。如果只有一个维修程序启动，则必须进入该维修程序。如果在同一时刻有多个维修程序，可任选进入其中的一个维修程序。维修程序必须从头开始，不能从中间插入。一个维修程序从第s个时间单位开始，持续 t个时间单位，则该维修程序在第s+t-1个时间单位结束。为了提高仪器使用率，希望安排尽可能少的维修时间。 -a precision instrument for the time n time units. Work with the equipment for some time synchronization equipment maintenance procedures. Once activated maintenance procedures, equipment maintenance procedures must be entered. If only a maintenance procedures initiated, it must be entered in the maintenance procedures. If at the same time a number of maintenance procedures, which can be optional to enter a maintenance procedures. Maintenance procedures to start from scratch, not from the middle inserted. A maintenance procedures's from the beginning of time units, sustained t time units, The maintenance procedures were in s t-a time to end units. To improve equipment utilization, arranging for minimal maintenance time.