Расположите пропущенные предложения в таком порядке чтобы получился связный текст. Sheet metal formi...: ответ на тест 933227 - Английский язык

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Sheet metal forming is widely used when parts of certain shape and size are needed. 1_______. One characteristic of sheet metal forming is that the thickness of the sheet changes little in processing. The metal is stretched just beyond its yield point (2 to 4 percent strain) in order to retain the new shape. 2_______. Shearing is a cutting operation similar to that used for cloth.
3_______. For example, to make the roof of an automobile from a flat sheet, the edges are gripped and the piece pulled in tension over a lower die. 4_______. And finally the edges are sheared off to give the final dimensions.

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1___________. There are two types: metal alloys and plastic polymers. The metal alloys were made first and they are usually an expensive mixture of titanium and nickel.
2_______:
- plastics that return to their original shape when the temperature changes.
One use is in surgery where plastic threads ‘remember’ the shape of a knot, react to the patient’s body temperature and make themselves into stitches.
- metal alloys  that have a ‘memory’ and can return to their original shape.
 3____________. The implant then expands back to its original shape.
- 4___________.

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1_______. This system was first developed in India in the 3rd century BC. 2_______.
The important innovation in the Arabic system was the use of positional notation, in which individual number symbols assume different values according to their position in the written numeral. 3_______. The symbol 0 makes it possible to differentiate between 11, 101, and 1,001 without the use of additional symbols, and all numbers can be expressed in terms of ten symbols, the numerals from 1 to 9 plus 0. 4_______.

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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 …