在一个单CPU的计算机系统中，采用按优先级抢占的进程调度方案，且所有任务可以并行使用I/O设备。现在有三个任务T1、T2和T3，其优先级分别为高、中、低，每个任务需要先占用CPU 10ms，然后再使用I/O设备13ms，最后还需要再占用CPU 5ms。如果操作系统的开销忽略不计，这三个任务从开始到全部结束所用的总时间为 （ ） ms
- A.61
- B.84
- C.58
- D.48
正确答案及解析
正确答案
解析
T1先10ms，T1再13ms i/o，同时T2的10ms，T3 CPU先运行3ms，T2 io 13ms，T1 cpu 5ms，cpu按高 中 低来进行安排，io可以并行10+13+5+5+2+3+2+13+5=58。
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