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[单选题]
一上升时间，延迟时间和峰值时间表征了控制系统的灵敏性，即响应的
A
A．稳定性 B．准确性 C．快速性D．可靠性
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试题答案：
C
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相关题目
什么是信息和信息的传递?试举例说明。
当系统已知，输出已知时，以识别输入或输入中的有关信息，称为系统辨识。
系统数学模型有哪些?采用哪些方法建立数学模型?
传递函数的定义是对于线性定常系统，在初始条件为零的条件下，系统_______的拉氏交换与_______的拉氏变换之比。
控制论的中心思想是A.一门即与技术科学又与基础科学紧密相关的边缘科学B.通过信息的传递.加工处理和反馈来进行控制C.抓住一切通讯和控制系统所共有的特点D.对生产力的发展.生产率的提高具有重大影响
下列是稳定系统的是（）
主导极点的特点是（）
采耀相位超前校正，相位超前越多，对于被校正系统来说
二阶系统当0<ξ<1时，如果增加ξ，则输出响应的最大超调量将（）
系统的开环对数幅频特性的（）表征着系统的稳态性能。
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14、【题干】国民党爱国将领蔡廷锴、蒋光鼐发动的抗日反蒋事件是【 】。
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有关法院调解，下列说法正确的是（）
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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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