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[单选题]
4.目前，管理信息系统的发展已经历了三代，依次为
A
制造资源规划系统、物料需求计划系统、企业资源规划系统
B
物料需求计划系统、制造资源规划系统、企业资源规划系统
C
物料需求计划系统、企业资源规划系统、制造资源规划系统
D
制造资源规划系统、企业资源规划系统、物料需求计划系统
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试题答案：
B
答案解释：
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从1，2，3，4，5……9中任取两个数，使它们的和为奇数，则不同的取法共有
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原文：……可我从头到脚淋成了落汤鸡了。 译文：…I was drenched from head to foot like a drowned cat.
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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)3.1 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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