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目前一个好的防病毒软件的作用是______。
A
A、检查计算机是否染有病毒，消除已感染的任何病毒B、杜绝病毒对计算机的感染C、查处计算机已感染的任何病毒，消除其中的一部分D、检查计算机是否染有病毒，清除已感染的部分病
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D
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38．四个进程A、B、C、D都要读一个共享文件F，系统允许多个进程同时读文件F，但进程A和进程C不能同时读文件F，进程B和进程D也不能同时渎文件F。为了使这四个进程并发执行时能按系统要求使用文件，现用P、V操作进行管理，请写出它们能正确执行的并发程序。
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社会主义社会和共产主义社会是（）
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3.5 The tone of the passage is____.(1分)
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目前一个好的防病毒软件的作用是______。
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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
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