Прочитайте текст и заполните пропуски подходящими по смыслу словами When a number of 1______________...: ответ на тест 347367 - Английский язык

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When a number of 1_______________ are hooked up in series so that the output of one serves as the input to the next amplifier stage, the function of the early stages is usually  2______________  the voltage to a high 3_______________, while the last stage builds up the power to a level sufficient to operate an output device. Audio amplifiers amplify electrical ac signals that have a frequency range corresponding to the range of human hearing, or from about 20 to 15,000 cycles per 4________________.

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When a number of 1_______________ are hooked up in series so that the output of one serves as the input to the next amplifier stage, the function of the early stages is usually to 2______________ up the voltage to a high 3_______________, while the last stage builds up the power to a level sufficient to operate an output device. Audio amplifiers amplify electrical ac signals that have a frequency range corresponding to the range of human hearing, or from about 20 to 15,000 cycles per 4________________.

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The principles of 1________________ in a simplified form might be stated as follows:
1. electromagnetic radiation at high radio frequencies is 2________________ to detect and locate remote reflecting objects;
2. the radiation is sent out in pulses of a few microseconds’ duration, separated by intervals many times the duration of each pulse;
3. the pulses are returned from the reflecting objects and the returns are detected and displayed by receiving equipment placed at the point of transmission;
4. 3________________   to the objects is determined by measurement of the time it took the pulses to reach the targets from the transmission equipment and return to it;
5. the directions of the targets are determined by use of highly directive radio 4__________________.

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The 1________________ is basically a three-section device composed of two outside sections and a middle section. The two outside 2______________ are doped so that they are either P- or N-tуре, and the middle section is doped opposite to the outside sections. Transistors are 3_________________ as NPN or PNP according to the doping of the sections or elements. When the two outside sections are N-type semiconductors and the middle section is a P-type, the transistor is an NPN-type. When the two 4_________________ sections are P-types and the middle is N-type, the transistor is a PNP-type.

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Experts believe that some boys are spending so much time playing computer games and watching violent films that they are living in a fantasy world. When girls talk about using home computers, they often discuss different types of software that they use for learning. Boys simply talk about computer games. When 14-year-old girls were asked what they would like to do in the future, they mentioned realistic jobs such as vet, teacher or doctor. The boys' answers were either very vague such as, "I just want to be happy and have lots of money" or unrealistic and they said things such as, "I want to be a fighter pilot”.
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What is the topic of girls’ discussion about using home computers?

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The quest for information can lead to stress. Almost two-thirds said their leisure time had been curtailed as a result of having to work late to cope with vast amounts of information; 70 percent reported loss of job satisfaction and tension with colleagues because of information overload.
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Why do you have to spend much leisure time to find the information you need?