Прочитайте текст и заполните пропуски подходящими по смыслу словами Electronics surrounds us everywh...: ответ на тест 223102 - Английский язык

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Electronics surrounds us everywhere. Television, tape-recording, radio-receiving - electronics is at the heart of them all. But that is only a small part of 1_______________ and not the most important at that. Extremely 2______________ electronic systems control the work of huge plants, enterprises and 3_______________ stations. Electronic appliances are indispensable for planning and controlling our national _______________.

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Electronics surrounds us everywhere. Television, tape-recording, radio-receiving - electronics is at the heart of them all. But that is only a small part of 1_______________ and not the most important at that. Extremely complicated electronic 2________________ control the work of huge plants, enterprises and 3_______________ stations. Electronic 4________________ are indispensable for planning and controlling our national economy.

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Electronic computers 1______________ the trajectories of spaceships, help prepare, launch and monitor the rockets that carry the most complicated and sophisticated equipment. Radio-electronic 2_____________ ensure reliable communication with space probes at distances amounting to scores of 3______________ of kilometres, relay telephotos of distant planets. Hundreds of 4______________ devices perform various tasks on board every satellite and spaceship. It may be said that in the near future electronics will surely make great strides and help the humanity gain new victories in science and engineering.

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Intensive 1______________ of radio-location began in the early forties. All these years the vacuum 2_______________ was the heart of electronics and, hence, the field of 3______________ was usually defined as the study of the motion of electrons in vacuum tubes. However, it was found that small, controlled 4______________ of gas introduced into a "vacuum tube" could make it perform switching, rectifying and other jobs. To include the category of gas-filled tubes, "vacuum tubes" became converted to "electron tubes" and the science of electronics was expanded to include the study of electron motion in gases.

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1____________ is an extremely simple-looking 2_______________. It is nothing more than a cylinder of synthetic ruby about 1/4 inches in 3_____________ and 1 1/2 inches long mounted in the centre of a spiral coil of glass. The coil is a xenon-filled flash 4_______________, very much like the ones used by photographers for taking flash pictures.

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The laser beam is 1_____________ by exciting the atoms of a suitable material - ruby is one - until most of the atoms have electrons orbiting in a higher energy level than usual. The excitation is then stopped and all the excited electrons fall back together, to their normal orbits, each one emitting a pulse of 2______________ of the same energy. In this way an intense beam of light is generated for a very short time. And 3______________ pulse or wave-train in this beam is in step with every other pulse. In this way a beam of light is obtained which is both monochromatic and coherent and easy to focus. This light is reflected by the mirror at one end of the tube. It can only escape at the other 4______________ of the tube.