若某航空公司的飞机订票系统有n个订票终端,系统为每个订票终端创建一个售票终端的进程。假设Pi(i=1,2,…,n)表示售票终端的进程,Hj(j=1,2,…,m)表示公共数据区,分别存放各个航班的现存票数,Temp为工作单元。PJ进程的工作流程如图6-2所示,a、b和c处将执行P操作和V操作,则图6-2中a、b和c应填入(25)。
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An instruction is made up of operations that(68)the function to be performed and operands that represent the data to be operated on. For example, if an instruction is to perform. the operation of(69)two numbers, it must know(70)the two numbers are. The processor's job is to(71)instructions and operands from memory and to perform. each operation. Having done that, it signals memory to send it(72)instruction.
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A firewall is a(71)system designed to(72)an organization's network against threats.
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在常用的字处理软件中,选中文本块后,按下Ctrl键再拖曳鼠标,可以()
There are many page replacement algorithms in the page management. Most frequently used algorithm is(69).
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