资本主义国家运用货币政策进行宏观调控，主要是对-湖北继续教育网网校

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[多选题]资本主义国家运用货币政策进行宏观调控，主要是对

A

B

C

D

E

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1. 资本主义社会为自身被新的社会制度所取代而准备的精神条件是（　　）
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)3.1 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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4. 设命题甲：k=1. 命题乙：直线y=kx与直线y=x+1.则A. 甲是乙的充分条件，但不是必要条件B. 甲是乙的必要条件，但不是充分条件C. 甲是乙的充要条件D. 甲不是乙的充分条件也不是乙的必要条件
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