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5、计算机输入设备,输出设备,其他输入输出设备都有哪些?
22.进程队列可以用进程控制块的________来形成。
指令和数据在计算机内部都是以区位码形式存储的。
一个Excel文档对应于一个()。(1分)
采用资源剥夺法可解除死锁,还可以采用______方法解除死锁。(1分)
3.批处理操作系统的主要缺点是
下列关于计算机病毒的说法正确的是______。(1分)
微机单机使用时,传染计算机病毒的主要渠道是通过( )。
文件系统最基本的目标是主要是通过______功能实现的。(1分)
使用格式刷,将格式传递给多处文本的正确方法________。 ①双击"格式刷"按钮 ②用格式刷选定想要应用格式的文本 ③选定具备所需格式的文本(1分)
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1.
(二)American society is not nap (午睡) friendly. In fact, says David Dinges, a sleep specialist at the University of Pennsylvania School of Medicine. "There's even a prohibition against admitting we need sleep". Nobody wants to be caught napping or found asleep at work. To quote a proverb: "Some sleep five hours, nature requires seven, laziness nine and wickedness eleven. " Wrong. The way not to fall asleep at work is to take naps when you need them. " We have to totally change our attitude toward napping", says Dr. William Dement of Stanford Univereity, the godfather of sleep research. ? Last year a national commission led by Dement identified an "American sleep debt" which one member said was as important as the national debt, The s concerned about the dangers of sleepiness: people causing industrial accidents or falling asleep while driving. This may be why we have a new sleep policy in the White House. According to recent reports, president Clinton is trying to take a half瞙our snooze (打瞌睡) every afternoon. ? About 60 percent of American adults nap when given the opportunity. We seem to have "a midafternoon quiet phase"also called"a secondary sleep gate. "Sleeping 15 minutes to two hours in the early afternoon can reduce stress and make us refreshed. Clearly, we were born to nap. ? We Superstars of Snooze don't nap to replace lost shut ye or to prepare for a night shift. Rather, we"snack"on sleep, whenever, wherever and at whatever time we feel like it. I myself have napped in buses, cars, planes and on boats; on floors and beds; and in libraries, offices and museums. 6. It is commonly accepted in American society that too much sleep is ______ . A. unreasonable B. criminal C. harniful D. costly
2.
计算机软件一般是指计算机系统中的程序及其_________。
3.
选出下列选项中划线部分读音不同的选项( )
4.
3.研究问题的具体化也称为
5.
简述二二八起义的过程及意义。
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