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[单选题]
具有里程碑意义的计算机网络是
A
DECNET
B
ARPANET
C
NSFNET
D
TELNET
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试题答案:
B
答案解释:
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模拟数据只能通过模拟信号进行传输。
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5.下列属于双密钥加密算法的是( )
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12.CPU处理中断,规定了中断的优先权,其中优先权最低的是
试比较模拟通信与数字通信。
17.对计算机网络安全构成威胁的因素可以概括为:偶发因素、自然因素和__________三个方面。
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1.
八、论述题:36小题,15分。
2.
3.Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)3.1Friction arises when____.(1分)A. an opposing force of motion existsB. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
3.
46.范围地址以(1)______分隔。47.SUM函数会计算参数列表中的(2)______。48.在Excel中对数据记录的处理方法是:首先选定表中的(3)______,然后执行“数据”菜单中的(4)______命令,此时屏幕上出现(5)______记录的记录单。49.PowerPoint的(6)______栏显示了PowerPoint的一些基本功能和和命令的快捷按钮。50.在PowerPoint中,当按下(7)______键时,在屏幕上显示Office助手对话框。51.PowerPoint提供了幻灯片,(8)______、(9)______和大纲4种打印选择。52.PowerPoint是在(10)______操作系统下进行的。53.Word 2003中的标题栏的右边有(11)______个控制按钮。54.在PowerPoint中提供了左对齐、右对齐、居中对齐、(12)______、(13)______5种对其方式。55.在PowerPoint窗口中海油一个小窗口,一般称为(14)______窗口。56.PowerPoint的(15)______栏用于显示幻灯片的序号或选用的模版等当前视图的有关信息。57.在退出PowerPoint窗口时,可双击PowerPoint标题左上角的“(16)______”按钮。58.双击一个演示文稿文件,计算机会自动启动(17)______并打开这个演示文稿。59.在“新幻灯片”对话框里提供了(18)______种版式。60.中文字体中默认的是(19)______,字号默认的(20)______。61.控制幻灯片外观一致的方法主要有(1)______、(2)______、(3)______。
4.
People enjoy reading ______ (humor) advertisements.
5.
三角劈B放在光滑水平桌面上,劈的光滑斜面的倾角为θ,高为h,如图所示,物体A由静止自斜面顶点滑下,用9表示重力加速度,设物体A滑向斜面底端时,相对桌面的速度为υ,则(??)
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