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[单选题]
26．下列选项中，不属于可靠性技术的是
A
A．设备冗余技术 B．容错技术 C．负荷分布技术 D．加密技术
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试题答案：
D
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18.系统分析阶段要确定开发系统的功能目标和
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(11年4月真题)“世界不是既成的事物的集合体，而是过程的集合体”。这是一种（ ）
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如图所示，在弹簧下端悬挂一质量为m的物体，弹簧原长为ι0，O为物体的平衡位置，现用手托着该物体，使它由弹簧原长处缓慢地移至平衡位置，手的托力对物体所做的功大小为W，现重新将此物体移至弹簧原长处，并由静止开始释放，则物体下降至平衡位置时的速度大小为__________．
4.
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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