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[单选题]
以生产资料私人占有和雇佣劳动为基础，以获取利润为生产经营目的的私有制经济是 （ ）
A
混合所有制经济
B
私营经济
C
集体经济
D
股份制经济
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参考答案
试题答案：
B
答案解释：
参考解析： 本题考查的是私营经济的概念，考生应识记，其他选项的概念考生也应掌握。私营经济，是指以生产资料私人占有和雇佣劳动为基础，以获取利润为生产经营目的的私有制经济。答案为B
相关题目
作为经济发展的“安全网”和“稳定器”的是 （ ）
商品交换发展的产物是． （ ）
国际金融危机爆发的原因有（ ）
银行信用产生和发展的基础是（ ）
掌握着金融资本，操纵国民经济命脉，并在实际上控制资产阶级国家政权的少数的大垄断资本家或垄断资本家集团是指 （ ）
单项选择题（本大题共30小题，每小题1分，共30分，在每小题列出的四个备选项中只有一个是符合题目要求的，错选、多选或未选均无分）
生产时间的组成部分包括（ ）A.劳动时间B.自然力独立作用于劳动对象的时间C.生产资料的储备时间D.出售商品实现其价值的时间E.正常的停工时间
简答题（本大题共5小题，每小题6分，共30分）
试分析怎样通过缩短生产时问和流通时问加快资本周转速度。
对国民收入进行再分配的主体是（ ）
热门试题
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)3.1 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
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若晶体三极管的集电结反偏、发射结正偏则当基极电流减小时，使该三极管
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