题目内容
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[主观题]
The power that an amplifier delivers to a load is equal to the difference between the power that the circuit draws from the power supply and the power that the circuit dissipates.
提问人：网友thq2000
发布时间：2022-01-07
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更多“The power that an amplifier de…”相关的问题
第1题
The idea that Man is an integral part of nature involves adapting the body to changes in the climate and regulating spiritual activities, daily food and clothing and living habits.
第2题
The measurement, gross weight, net weight and the cautions such as “Do not stack up and down”, “Keep away from moisture”, “Handle with care” shall be stenciled on the surface of each package with fadeless pigment.
第3题
In what ways are the showy monkey and the gnat similar?
A、They both had good skills and wanted to show off
B、They both are modest and have good skills
C、They both know what to do at the right time
D、They both got killed by human beings
第4题
To say that the child learns by imitation and that the way to teach is to set a good example is a bit oversimplified. No child imitates every action he sees. Sometimes, the example the parent wants him to follow is ignored while he takes over contrary patterns from some other ' example. Therefore we must turn to a more subtle theory than "Monkey see, monkey do".
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Look at it from the child's point of view. Here he is in a new situation, lacking a ready response. He is seeking a response which will gain certain ends. If he lacks a ready response for the situation, and cannot reason out what to do, he observes a model who seems able to get the right result. The child looks for an authority or expert who can show what to do.
There is a second element at work in this situation. The child may be able to attain his immediate goal only to find that his method brings criticism from people who observe him. When shouting across the house achieves his immediate end of delivering a message, he is told emphatically that such a racket is unpleasant, that he should walk into the next room and say his say quietly. Thus, the desire to solve any objective situation is overlaid with the desire to solve it properly. One of the early things the child learns is that he gets more affection and approval when his parents like his response. Then other adults reward some actions and criticize others. If one is to maintain the support of others and his own self-respect, he must adopt responses his social group approves.
In finding trial responses, the learner does not choose models at random. He imitates the person who seems a good person to be like, rather than a person whose social status he wished to avoid. If the pupil wants to be a good violinist, he will observe and try to copy the techniques of capable players; while some other person may most influence his approach to books.
Admiration of one quality often leads us to admire a person as a whole, and he becomes an identifying figure. We use some people as models over a wide range of situations, imitating much that they do. We learn that they are dependable and rewarding models because imitating them leads to success.
The statement that children learn by imitation is incomplete because ______.
A．they only imitate authorities and experts
B．they are not willing to copy their parents
C．the process of identification has been ignored
D．the nature of their imitation as a form. of behavior. has been neglected
第5题
Before Sandra opened her florist shop she read all she could about the floral industry. She also consulted several published research reports to understand growth patterns in the local area with particular interest in the location of florists throughout the city. This ________ helped her to decide on the location of her store.
A、primary data
B、secondary data
C、primitive data
D、tertiary information
E、licensed information
第6题
The connecting line between the spacial point and its horizontal projection reflects the distance of the point to the horizontal plane of projection, and it equals the coordinate X of the point.
第7题
Calculate the voltage gain for voltage series feedback when the amplifier gain is A = -2000 and F = -1/50.
A、-2000
B、-1/50
C、50
D、-48.78
第8题
An amplifier has a gain-bandwidth product of 200 MHz. A feedback network is added that has a feedback factor (1 + βA) of 18.88. What is the gain-bandwidth product for the circuit with the added feedback network?
A、10.59 MHz
B、18.88 MHz
C、200 MHz
D、None of the above
