Вопрос № 1072320 - Английский язык

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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.

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The inclusion of other elements affects the properties of the steel. Manganese gives extra strength and toughness. Steel containing 4 per cent silicon is used for transformer cores or electromagnets because it has large grains acting like small magnets. The addition of chromium gives extra strength and corrosion resistance, so we can get rust-proof steels. Heating in the presence of carbon or nitrogen-rich materials is used to form a hard surface on steel (case-hardening). High-speed steels, which are extremely important in machine-tools, contain chromium and tungsten plus smaller amounts of vanadium, molybdenum and other metals.
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Steel containing 4 per cent silicon …

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The plastics that were unknown only a few decades ago have become extremely important and widely used for construction purposes. The plastics being used nowadays possess many advantages. First of all they are extremely light and their tensile strength is greater than that of many metals. Besides, they are weather-resistant and resistant to a great number of chemical substances. Some of the examples of the constructive use of plastic materials have been domes housing radar antennae and electronic equipment. Such domes built in America and Canada are as high as 116 feet.
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The tensile strength of plastics is …

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1) 1_______ flooring battens of the same wood.
2) Lay the parquet 2_______ only after all preparatory work has been done.
3) Parquet strips should be laid in the direction of the 3_______.
4) Every strip should be 4_______ toward the previously laid one.

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1) Tiles should be laid 1_______ after the mastic has been applied.
2) 2_______ the tiles tightly to the subfloor.
3) Cut the tiles with a 3_______.
4) For a better adhesion tap the 4_______ into position with a rubber mallet.

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1) Scratch, 1_______, and wash out the subfloor.
2) When making a floor with a rectangular 2_______ set the tiles parallel to the wall.
3) Apply 3_______ to the subfloor only for one course of tiles.
4) Lay the tiles to the 4_______design.