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【简答题】
Windows 98 通过将计算机系统“改装”成虚拟机来实现多任务处理。Windows虚拟机分为两种基本类型，即系统虚拟机和 【16】 虚拟机。
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】根据不同的安全需求确定计算机及其操作系统的安全等级。美国国防部1985年公布的“可信计算机系统评估标准”中将计算机系统的安全等级分为4类7级：D、C1、C2、B1、B2、B3、A，其中，最高安全等级为______。
A.
D级
B.
C1级
C.
B1级
D.
A级
【单选题】49（） A. Talking on a cell phone while driving brings you joy anyway. B. The estimate is based on surveys with office workers. C. The younger group did 10 percent better when not interrupted. D. Howeve...
A.
A Bad Idea
B.
Think you can walk, drive, take phone, calls, e-mail and listen to music at the same time Well, New York’s new law says you can’t (46) The law went into force last month, following research and a shocking number of accidents that involved people using electronic gadgets(小巧机械)when crossing the street.
C.
Who’s to blame (47) "We are under the impression that our brain can do more than it often can," says Rene Marois, a neuroscientist(神经科学家)in Tennessee. "But a core limitation is the inability to concentrate on two things at once."
D.
The young people are often considered the great multitaskers. (48) A group of 18- to 21-year-olds and a group of 35-to 39-year-olds were given 90 seconds to translate images into numbers, using a simple code. (49) But when both groups were interrupted by a Phone call or an instant message, the older group matched the younger group in speed and accuracy.
E.
It is difficult to measure the productivity lost by multitaskers. But it is probably a lot. Jonathan Spira, chief analyst at Basex, a business-research firm, estimates the cost of interruptions to the American economy at nearly ＄ 650 billion a year. (50) The surveys conclude that 28 percent of the workers’ time was spent on interruptions and recovery time before they returned to their main tasks.
【单选题】以下（ ）不是车站计算机系统主要完成的功能。
A.
接受线路中央计算机系统下发的系统运行参数、运营模式和黑名单等，并下传给车站检票设备
B.
采集车站售检票设备的原始交易数据和设备状态数据，并上传给线路中央计算机系统。
C.
能完成清算对账工作
D.
对车站售票设备进行实时监控，并能显示设备的通信、运营状态及故障等信息