成人高考专升本政治考试模拟试题及答案(2)
- 试卷类型：历年真题
- 总 分：150.5分
- 时 长：120分钟
- 试卷难度：
- 考试人数：1192人
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- 1. 对某种商品采用从量税和从价税同时征收的关税是 （ ）
- 2. 16.关于水资源开发利用的规定，下列表述正确的是
- 3. 1.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)1.1 Friction arises when____.(1分)A. an opposing force of motion exists B. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
- 4. 21、【题干】邓小平在 1979 年 3 月的中央理论工作务虚会上明确提出必须坚持什么原则【 】。
- 5. 在FrontPage 中，要使页面上能显示访问次数，可使用( )实现。
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