参考答案
试题答案：
(1)物理安全控制
(2)人员及管理控制
(3)存取控制
(4)数据加密
热门试题
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1.
第五部分:填词补文(第31~40题，每题1.5分，共15分)下面的短文有10处空白，短文后列出12个词，其中10个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌,并在答题卡相应位置上将答案选项涂黑。Bowling (保龄球) in AmericaBowling is a leisure activity. It is enjoyed by peopleof ___31___ all ages. It's seen as a wayto ___32___ a night with family and friends. But how did this sport ___33___ its start? In spite of varied ___34___ on its origin, bowling came to the US in the 18th century. Over time,it has developed from a religious ___35___ to a leisure activity. While it may be ___36___ to find out who invented the ___37___, its influence on culture has led to the sport becoming a part of the lives of people. No matter where bowlingis from,it is ___38___ exciting. It will contiue to ___39___ bowling lovers all over the world. So whether you're an expert or ___40___ to the ativiy, enjoy it and have fun!
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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
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3.
阅读《哦，香雪》中的一段文字，回答问题：
七点钟，火车喘息着向台儿沟滑过来，接着一阵空哐乱响，车身震颤一下，才停往不动了。姑娘们心跳着涌上前去，像看电影一样，挨着窗口观望。只有香雪躲在后边，双手紧紧捂着耳朵。看火车，她跑在最前边；火车来了，她却缩到最后去了。
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4.
按建设项目经济评价的内容分类可分为（）
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5.
已知向量a=(0,1),b=(2,x),若b⊥(b-4a)，则x=____
