Вопрос № 606986 - Английский язык

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Unlike digital computers - which started out as mechanical devices and then went through a brief electromechanical period during the 1930s, finally becoming electronic only in the 1940s - television was an electrical medium from the very beginnings.
Attempts to send images over distances with the use of electricity date to 1876, the year Alexander Graham Bell invented the telephone.

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Unlike digital computers – which started out as mechanical devices and then went through a brief electromechanical period during the 1930s, finally becoming electronic only in the 1940s – television was an electrical medium from the very beginnings.
Attempts to send images over distances with the use of electricity date to 1876, the year Alexander Graham Bell invented the telephone.

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To determine blood groups, there is a method of extracting a chemical from human blood which, when mixed with a sample of the blood in question will react in a particular way according to the blood group. However, to get enough of the solution a great deal of human blood is required. But fortunately, snails’ eggs, which are the size of a pinhead, contain the same chemical – in fact, the blood of five donors would be required to supply the same amount of the chemical as is found one of the snail’s eggs.

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Before machines were invented, shoes like the ones we wear today took a long time to make. In 1846, Elias Howe made a strong sewing machine, and then, in 1858, Lyman Blake changed this machine so it could sew shoes. In 1875, Goodyear Welt made a new machine for making shoes quickly. It was called the Goodyear Welt sewing machine. With this machine Goodyear made cheap shoes from rubber. Nowadays we remember Goodyear because he has made other things with rubber.
Today, people wear shoes made from animal skins, cloth, rubber, and plastic. Shoes have come a long way from the first skin and leaf shoes – and with new machines, they will change a lot more.

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Probably since the time of the first humans, people have eaten honey made by bees. For many thousands of years, they took the honey from bees’ nests in trees without understanding very much about the lives of bees. Slowly, however, people realized that it would be simpler to keep bees than to have to try to find their nests. At first they kept them in hollow parts of trees or small clay containers which they hung from the trees. Nowadays in most countries they are kept in wooden hives.

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Heat causes liquids to expand. This effect is used in the 1_______. An increase in air temperature 2_______ the liquid to expand in the heat sensor. This expansion causes the valve to close and consequently the 3_______ of hot water is reduced.
After a time, the temperature will go down and the liquid will cool and contract. The spring load will now be greater than the liquid pressure and the valve will open. Once again, the hot water flow 4_______.