Прочитайте текст и выберите утверждение соответствующее содержанию текста A communication system tha...: ответ на тест 606967 - Английский язык

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A communication system that does not allow an interchange between the message source and the receiver is said to be a one-way or "simplex" communication setup. One that does allow an interchange is a two-way or "duplex" setup. Noise is an important concept in communication theory. Noise is defined in communication theory as any signal that interferes with the message being sent and is an undesired disturbance in a communication system. Radio static is a form of noise. Dirt on a camera lens is noise also.

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A communication system that does not allow an interchange between the message source and the receiver is said to be a one-way or "simplex" communication setup. One that does allow an interchange is a two-way or "duplex" setup. Noise is an important concept in communication theory. Noise is defined in communication theory as any signal that interferes with the message being sent and is an undesired disturbance in a communication system. Radio static is a form of noise. Dirt on a camera lens is noise also.

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The study of electricity began with Dr. Gilbert who lived at about the same time as Galileo. In 1600 he wrote a book describing experiments on electricity and magnetism.
Russia played an important part in the development of electrical science. In spite of difficult conditions under which the scientists and inventors had to work in tsarist Russia they discovered electrical phenomena of great importance. In addition to that Russian scientists and inventors always tried to find practical application for the phenomena discovered.

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The first work on electricity published in Russia was that written by the father of Russian science Lomonosov. Lomonosov was the first to find that heat, light and electricity are different forms of movement. He was also the first to find the electrical nature of some atmospheric phenomena.
Academician Petroff was the first scientist in the world who observed the phenomena known later as the electric arc.

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Another Russian scientist Yablochkov made a great contribution to the development of electrical science. It was Yablochkov who created the principle of a transformer. It is he who found the first practical application of the electric arc.
Thanks to Lodygin’s great discovery, an electric lamp lights up our rooms.
Popov transmitted signals by means of electromagnetic waves and gave the world his great discovery - radio.
It is Lebedev who discovered and measured the pressure of light. The photoelectric effect was among the numerous discoveries of the famous Russian scientist Stoletov.
However, it is impossible even to list here the great inventions and discoveries that our scientists made in various fields of science and engineering.

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Electricity is the power that has made possible the engineering progress of today. In fact, electricity has always been with a man, but only within the last few centuries he has learned to apply it.
One hundred years ago there were neither electric lamps, nor electric motors, nor telephone, nor radio. Now electricity is everywhere. We use electricity in our homes and in buildings where we work or study. Electric lamps light our rooms. The uses of electricity in our homes do not end with producing light. How many electric motors are working in our homes! Electric motors operate washing machines, refrigerators, vacuum cleaners, fans, clocks, and other electrical appliances.