说明：  这是模拟三个进程如何在系统的调度下运行的，其结果存放在jc.c文件中，可便初学都对进程的运行有更深该的认识。
(This is how the simulation process in three Scheduling System running, and its findings jc.c stored in a document, then the process of learning all of the operations have a better understanding.)