中药“十八反”中白及反:( )
A. 乌头
B. 半夏
C. 知母
D. 瓜蒌
E. 香附
一个作业8:00到达系统,估计运行时间为1h,若10:00开始执行该作业,其响应比是____。
The operating system must make _________ types of scheduling decisions with respect to the execution of processes.
A. six
B. five
C. four
D. three
This is a decision whether to add a process to those that are at least partially in main memoryand therefore available for execution:
A. long-term scheduling
B. I/O scheduling
C. short-term scheduling
D. medium-term scheduling