Расположите пропущенные предложения в таком порядке чтобы получился связный текст. The open hearth a...: ответ на тест 1046355 - Английский язык

Расположите пропущенные предложения в таком порядке, чтобы получился связный текст.
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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One of the views of law is that it is a method of social control – an instrument of social, political, and economic change. 1_______. It is difficult to determine whether the law brings about changes in our society or whether changes of society bring about a change in the law. 2_______. The law-responding to the goals, desires, needs, and aspirations of society is in a constant state of change. 3_______. In this event the law and our legal system provide leadership in bringing about changes. At other times our society is ahead of the law in moving in new directions, and changes are brought about by the people who act according to their new attitude and convictions. When these changes are accepted by the rest of society, it often happens that the law then gives approval and recognition of the changes, and the law has thus been brought into line with the changing needs of society. 4_______. As a result of this laws have been enacted that require that devices be installed to control pollution. Here the public pressure resulted in the enactment of laws and the law was a follower rather than a leader. It is important to note that the law is not static – that it is constantly changing and that the impetus for the changes may come from many different sources.

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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 …

Заполните пропуски в инструкции следующими словами:
1) These ear protectors must be carried everywhere in the 1_______ hangar.
2) These 2_______ must be lubricated every day.
3) Drivers are required to check the 3_______, lights, tyres, and water before a long car journey.
4) Apprentices must always wear 4_______ in the workshop.