Прочитайте текст и найдите соответствующий перевод подчеркнутого слова. The combinations of two or m...: ответ на тест 933221 - Английский язык

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The combinations of two or more different materials are called composite materials. They usually have unique mechanical and physical properties because they combine the best properties of different materials. For example, a fibre-glass reinforced plastic combines the high strength of thin glass fibres with the ductility and chemical resistance of plastic. Nowadays composites are being used for structures such as bridges, boat-building etc.

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The combinations of two or more different materials are called composite materials. They usually have unique mechanical and physical properties because they combine the best properties of different materials. For example, a fibre-glass reinforced plastic combines the high strength of thin glass fibres with the ductility and chemical resistance of plastic. Nowadays composites are being used for structures such as bridges, boat-building etc.

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Ductility is the ability of a material to deform without breaking. One of the great advantages of metals is their ability to be formed into the shape that is needed, such as car body parts. Materials that are not ductile are brittle. Ductile materials can absorb energy by deformation but brittle materials cannot.

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Hardening of plain carbon steel consists of two stages; first heating to a specific temperature and then cooling rapidly. The cooling process is known as quenching. The correct temperature to which steel must be heated varies with its carbon content.
Overheating can cause grain growth, resulting in weak components.

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The most important metal in industry is iron and its alloy – steel. 1_______. It is strong but corrodes easily through rusting, although stainless and other special steels resist corrosion. 2_______. 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. 3_______. 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. 4_______.

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A rectifier is a device which allows an electric power to pass in one direction but not in the opposite direction. 1________. Four of the most common are described below:
Selenium rectifiers are made of an aluminium plate with a selenium coating. 2_______. Instrument rectifiers are normally of the cooper oxide type, which consists of a copper disc with a cuprous oxide coating. 3_______. They are suitable for all power rectification, but are particularly useful for the low to medium power range. Thermionic diodes are found in radio circuits. 4_______.