说明：   进程调度 进程调度算法有FIFO，优先数调度算法，时间片轮转调度算法，分级调度算法，目前主要是考FIFO和优先数调度算法（静态优先级）。
(process scheduling process FIFO scheduling algorithm is priority number scheduling algorithm, time-Cycle Scheduling algorithm, grade scheduling algorithm, the key is to test a few priority and FIFO scheduling algorithm (static priority).)