Прочитайте текст и найдите соответствующий перевод подчеркнутого слова. Numerals are signs or symbol...: ответ на тест 1046351 - Английский язык

Прочитайте текст и найдите соответствующий перевод подчеркнутого слова.
Numerals are signs or symbols for graphic representation of numbers. The earliest forms of numerical notation were simply groups of straight lines, either vertical or horizontal, each line corresponding to the number 1. Such a system was inconvenient when dealing with large numbers.

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Numerals are signs or symbols for graphic representation of numbers. The earliest forms of numerical notation were simply groups of straight lines, either vertical or horizontal, each line corresponding to the number 1. Such a system was inconvenient when dealing with large numbers.
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Numerals are …

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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 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_______.

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The open hearth and semi-muffle furnace are cheap to buy, and very easy to operate. 1_______. However, unlike the muffle furnace, it is difficult to heat the furnace evenly throughout the chamber and also to control the build-up of gases from the burner as they have no flue outlet. 2_______. In the open hearth furnace, it is also difficult to control the temperature in the chamber.
3_______. It is cheap, simple to operate, economical, and it also has good temperature control. However, it does not heat evenly or have good atmosphere control.
The muffle furnace is the most efficient of these three furnaces. 4_______. However, it is not cheap, simple to operate, or economical.