Прочитайте текст и заполните пропуски подходящими по смыслу словами Laser beams 1_____________ it po...: ответ на тест 347361 - Английский язык

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Laser beams 1_____________ it possible not only to transmit light 2______________ over great distances, but also to encase it in very thin glass filaments - waveguides. It is possible to transmit simultaneously thousand telephone 3______________ and many 4______________ programmes over a single guide a tenth of a millimetre thick.

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Laser beams 1_____________ it possible not only to transmit light 2______________ over great distances, but also to encase it in very thin glass filaments - waveguides. It is possible to transmit simultaneously thousand telephone 3______________ and many 4______________ programmes over a single guide a tenth of a millimetre thick.

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Thermionic emission is the most important and one most commonly used in electron 1_______________. In this method 2________________ is heated, resulting in increased thermal or kinetic energy of the unbound electrons. Thus, a greater number of electrons will attain sufficient speed and energy 3________________  from the surface of the emitter. The number of electrons released per unit area of an emitting surface is related to the absolute temperature
of the cathode and a quantity of the work must perform when escaping from the emitting surface.

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We are finally ready to apply the knowledge we gained in previous sections about electrons, vacuum 1_________________ and transistors to some practical matters. In the following sections we shall consider a variety of circuits employing electron tubes and transistors. 2_________________ are combinations of tubes or transistors with other components, such as resistors, capacitors and inductors, and form the 3________________ building blocks of electronic systems: radio, automatic computer and so on. To understand the systems, you must be familiar with the circuits that 4_______________ them up.

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Now we shall discuss amplifier circuits, or more specifically, audio amplifiers. 1 _________ is an electron tube or transistor circuit, which 2_________________ up an ac signal applied to its input. It is called a voltage amplifier if the magnitude of the output  3  __________ . From the amplifier is considerably greater than that of the input voltage. As a matter of fact the ratio of the output voltage to the 4__________________ voltage is called the amplification or gain of the amplifier.

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There are 1_______________ power amplifiers. These are similar to voltage amplifiers, except that their main 2__________________ is to supply a considerable amount of 3________________ i. e. voltage times current to the output or load 4________________, although the ac input signal may not draw any grid current and, hence, the input power may be zero.