Расположите пропущенные предложения в таком порядке чтобы получился связный текст. A rectifier is a ...: ответ на тест 1046354 - Английский язык

Расположите пропущенные предложения в таком порядке, чтобы получился связный текст.
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 value of money is reflected by its purchasing power – the rate at which money is exchanged for goods and services. 1_______. The purchasing power of each dollar can be compared over time by accounting for changes in the price level. 2_______. 3_______. The value of a 1986 dollar is therefore 100/328, or about 0.30 measured in 1967 dollars. 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.

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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 development of transport facilities was very important in the growth of the United States. The first travel routes were natural waterways. No surfaced roads existed until the 1790s, when the first highways were built. Besides the overland roads, many canals were constructed between the late 18th century and 1850 to link navigable rivers and lakes in the eastern United States and in the Great Lakes region.
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The first highways were built …

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Naval architects are engineers who design and supervise construction of ships. Ships must be designed and built so that they are safe, stable, strong, and fast enough to perform the type of work intended for them. A naval architect must be familiar with the variety of modern shipbuilding.
Marine engineering is a specialized branch of mechanical engineering devoted to the design and operation of systems, both mechanical and electrical, needed to propel a ship. Engineers in this field develop diesel engines and steam turbines that provide enough power to move the ship at the required speed.
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A naval architect must be familiar with …