Вопрос № 911479 - Английский язык

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As the population increases, the problem of water supply in many desert regions becomes more urgent with every year.
Scientists consider that the best way to solve this problem is to construct plants that will use atomic energy to distill fresh water from the sea. It is believed that it will be cheaper to distill sea water than to make new freshwater reservoirs.

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Most cars use water to cool the 1_______. Water flows from the radiator through a 2_______ of water passages and rubber 3_______. A water pump pushes the water round. This system is known a 4_______ system .

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Some measuring 1_______ are fitted with dials. To prevent 2_______ readings, always read the dial correctly. Read the deal from 3_______ in front so that the reflection is behind the needle. If the 4_______ is not viewed from the front the reading will be incorrect.

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What does the bricklayer do first?
Watch the bricklayer. First, he picks up a brick. Then, he spreads mortar on it. Next, he puts the brick on the concrete. Then, he checks that it is level. Then, he picks up another brick…

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What is lead monoxide used for?
Lead is now a very expensive metal. At one time it was used extensively for roofing and for water piping because of its softness and resistance to corrosion. But later copper and iron have taken its place. Lead is a grey malleable metal which melts at 327 ̊C, which is low for a metal. Lead is still used for roofing and for making waste pipes and sink traps because it is easily bent into shape; storage battery (accumulator) plates; storage tanks for sulphuric acid; lead shot; solder; screens to stop harmful radiation from radioactive substances. Lead monoxide is used for making glass that is brilliant and sparkling, i.e. decorative tableware.

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Where are steels of low carbon content used?
The most important metal in industry is iron and its alloy – steel. Steel is an alloy of iron and carbon. It is strong but corrodes easily through rusting, although stainless and other special steels resist corrosion. The amount of carbon in steel influences its properties considerably. Steels of low carbon content (mild steels) are quite ductile and are used in the manufacture of sheet iron, wire and pipes. Medium-carbon steels containing from 0.2 to 0.4 per cent carbon are tougher and stronger and are used as structural steels. Both mild and medium-carbon steels are suitable for forging and welding. High-carbon steels contain from 0.4 to 1.5 per cent carbon, are hard and brittle and are used in cutting tools, surgical instruments, razor blades and springs. Tool steel also called silver steel, contains about 1 per cent carbon and it is strengthened and toughened by quenching and tempering.