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[单选题] 诺兰模型的六个阶段中，单项应用大量涌现带来种种矛盾，企业会采取措施抑制IT支出的无序增长的阶段是（ ）
A
萌芽
B
控制
C
扩散
D
集成
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参考答案
试题答案：
B
答案解释：
在控制阶段，单项应用大量涌现带来种种矛盾，企业会采取措施抑制IT支出的无序增长。答案为B
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规范有序的编码在系统设计中的地位非常重要，编码的规范性要求，编码时不要（ ）
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专线连接
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下列说法错误的是（ ）
21．从技术角度看，结构化设计对模块划分的基本要求是
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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.
37.背景资料：
3.
在简单之债的情况下，如债的标的物由于不可归责于双方当事人的原因而无法履行时，发生下列哪种情况（ ）
4.
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