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【单选题】
以下关于操作系统中多任务处理的叙述中，错误的是（）。
A.
将CPU时间划分成许多小片，轮流为多个程序服务，这些小片称为时间片
B.
由于CPU是计算机系统中最宝贵的硬件资源，为了提高CPU的利用率，一般采用多任务处理
C.
正在CPU中运行的程序称为前台任务，处于等待状态的任务称为后台任务
D.
在单CPU环境下，多个程序在计算机中同时运行时，意味着它们宏观上同时运行，微观上由CPU轮流执行
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举一反三
【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 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 yst at Ba, 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】操作系统的设备管理功能是对系统中的外围设备( )。
A.
提供相应的设备驱动程序，初始化程序和设备控制程序等
B.
直接进行操作
C.
通过人和计算机的操作系统对外围设备直接进行操作
D.
既可以由用户干预，也可以直接执行操作
【单选题】下列关于操作系统的叙述中，正确的是______。
A.
批处理作业必须有作业控制信息
B.
分时系统不一定都具有人机交互的功能
C.
从响应时间的角度来看，实时系统与分时系统的要求差不多
D.
由于采用了分时系统，用户可以独占计算机的文件系统
【单选题】非抢先式实时操作系统的实时性取决于（）
A.
中断响应时间
B.
最长任务执行时间
C.
任务切换时间
D.
所有其它任务执行时间之和
相关题目：
【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 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 yst at Ba, 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】操作系统的设备管理功能是对系统中的外围设备( )。
A.
提供相应的设备驱动程序，初始化程序和设备控制程序等
B.
直接进行操作
C.
通过人和计算机的操作系统对外围设备直接进行操作
D.
既可以由用户干预，也可以直接执行操作
【单选题】下列关于操作系统的叙述中，正确的是______。
A.
批处理作业必须有作业控制信息
B.
分时系统不一定都具有人机交互的功能
C.
从响应时间的角度来看，实时系统与分时系统的要求差不多
D.
由于采用了分时系统，用户可以独占计算机的文件系统
【单选题】非抢先式实时操作系统的实时性取决于（）
A.
中断响应时间
B.
最长任务执行时间
C.
任务切换时间
D.
所有其它任务执行时间之和
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