问题 单项选择题

UNIX操作系统是作为______问世的。

A.网络操作系统
B.分时操作系统
C.批处理操作系统
D.实时操作系统

答案

参考答案:B

解析:操作系统可以分为网络操作系统、分时操作系统、批处理操作系统、实时操作系统、分布式操作系统。
(1)网络操作系统。计算机网络是利用通信机构把独立,分散的计算机连接起来的一种网络。网络操作系是网络软件组成之一,在网络协议配合下,实现资源共享,提供网络通信和网络服务等功能。
(2)分时操作系统。指计算机联接多个终端,系统把主机分为若干时间片,每个终端用户占用一个时间片,各用户按一定顺序轮流占用主机。分时的时间单位叫做时间片,即允许一个终端用户占用CPU的长短。分时系统的基本特征为:同时性,交互性,共享性。UNIX,XENIX属于分时操作系统。
(3)批处理操作系统。指用户将机器要做的工作有序地排在一起形成一个作业流,计算机系统自动地,顺序地执行作业流批处理系统中,人和计算机不再交互信息。批处理系统又分为单道批处理和多道批处理系统。
(4)实时操作系统。它一般为专用机设计,是实时控制系统和实时处理系统的统称。实时控制用于生产过程控制,导弹发射控制等;实时处理:指计划管理,情报检索,飞机订票系统等。实时系统的特点是,响应及时性和高可靠性。
(5)分布式操作系统。在分布式操作系统中,拥有多台计算机并且各台计算机无主次之分,系统资源共享,任意两台计算机可以交换信息,系统中若干台计算机可以互相协作来完成一个共同任务。它主要用于分布式系统资源的管理。

单项选择题

In WAR MADE EASY Norman Solomon demolishes the myth of an independent American press zealously guarding sacred values of free expression. Although strictly focusing on the shameless history of media cheerleading for the principal post World War II American wars, invasions, and interventions, he calls into question the entire concept of the press as some kind of institutional counterforce to government and corporate power.
Many of the examples compiled in this impeccably documented historical review will be familiar to readers who follow the news on the Internet. But such examples achieve fresh impact because of the way Solomon has organized and analyzed them. Each chapter is devoted to a single war hawk argument ("America Is a Fair and Noble Superpower," "Opposing the War Means Siding with the Enemy," "Our Soldiers Are Heroes, Theirs Are Inhuman"), illustrated with historical examples from conflicts in the Dominican Republic, E1 Salvador, Vietnam, Grenada, Panama, Kosovo, both Iraq wars, and others in which the media were almost universally enthusiastic accomplices.
The book should really be subtitled "War reporting doesn’t just suck, it kills. "it makes you feel like demanding a special war crimes tribunal for corporate media executives and owners who joined the roll-up to" shock and awe" as non-uniformed psywar ops. To be sure, this would raise the issue of whether or not following orders might suffice for the defense of obedient slaves such as Mary McGrory and Richard Cohen, who performed above and beyond the call of duty. "He persuaded me, " ncGrory gushed(热情洋溢地表达) the morning after Colin Powell addressed a plenary session of the United Nations on February 5, 2003, declaring that Iraq had weapons of mass destruction. " The cumulative effect was stunning. "In the same Washington Post edition, Cohen wrote.
The evidence he presented to the United Nations—some of it circumstantial, some of it absolutely bone-chilling in its detail—had to prove to anyone that Iraq. not only hasn’t accounted for its weapons of mass destruction but without a doubt still retains them. Only a fool—or possibly a Frenchman—could conclude otherwise.
Solomon demonstrates how this kind of peppy prewar warm up degenerates into drooling and heavy breathing once the killing begins. As if observing a heavy metal computer game, the pornographers of death concentrate on the exquisite craftsmanship and visual design of the murder machines and the magnificence of the fiery explosions they produce.

Solomon mentioned the computer game in order to ______.

A.blame the press for its guilt in the war

B.compare the prewar preparations and the real war

C.stress the large scale of mass destruction

D.describe the visual effects of the murder machines

单项选择题 案例分析题