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25.【题干】2001 年，中国对外开放进入一个新阶段的标志是
A
A．开放十四个沿海港口城市B．设立海南经济特区C．开发和开放上海浦东新区D．加入世界贸易组织
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D
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《天朝田亩制度》的中心内容是（ ）
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25．在抗日战争的战略防御阶段，国民党军队在正面战场上取得胜利的战役是
戊戌维新时期，维新派在上海创办的影响较大的报刊是
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1940年，八路军对侵华日军发动大规模进攻的战役是
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15．特别行政区法官的任命权属于
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我国《婚姻法》第21条规定：父母不履行抚养义务时，未成年的或尚不能独立生活的子女，有要求父母给付抚养费的权利。以下情形中，属于“不能独立生活的子女”有
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18．为表现整体环境与气氛，选择相机的镜头是
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18.社会主义国家的学校在政治教育中教授的内容是
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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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