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[单选题]
20.一般来说,发达国家商品的国别价值
A
高于国际价值
B
低于国际价值
C
与国际价值大体相等
D
与国际价值无法比较
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试题答案：
B
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我国在新时期经济发展的主线是（ ）
某繁华地段上一家店铺月租金是5万元，另一地段上相同店铺的月租金是3万元，前者多交的2万元属于（ ）
简述影响经济发展的主要因素。
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在国家垄断资本主义条件下，垄断资产阶级的总代表是
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主要资本主义国家相继由自由竞争阶段发展到垄断阶段的时间是 （ ）
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1.
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
2.
18.投资银行对新兴公司在创业期和拓展期进行的资金融通业务是
3.
24．1951 年底到 1952 年春，中国共产党在党政机构工作人员中开展的运动是
4.
美国学前教育机构的两种主要类型之一是（）。
5.
是让系统的切换分期分多阶段完成，每次用新系统代替旧系统中的一个部分，直到整个系统全部交接。( )
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