Прочитайте текст и заполните пропуски подходящими по смыслу словами Most cars use water to cool the ...: ответ на тест 284261 - Английский язык

Прочитайте текст и заполните пропуски подходящими по смыслу словами
Most cars use 1_______ to cool the engine. Water 2_______ from the radiator through a system of water passages and rubber hoses. A water 3_______ pushes the water round. This system is known a 4_______ system.

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Most cars use 1_______ to cool the engine. Water 2_______ from the radiator through a system of water passages and rubber hoses. A water 3_______ pushes the water round. This system is known a 4_______ system.

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The raw materials for plastics are coal and 1_______, and many plastic materials today are produced from oil. Plastics can be divided into two main 2_______. The first group, called thermoplastics, includes well-known plastics such as PVC, nylon and polythene. These can be treated (heated, softened and cooled) several times, and can be formed into combs, pipes and bags, in addition to many other similar 3_______.
Thermosetting 4_______ include melamine, polyurethane and phenolic resin, and can be made into tableware, foams and plugs respectively. However, this group differs from thermoplastics because they can be treated only once and harden when they are heated.

Прочитайте текст и заполните пропуски подходящими по смыслу словами 1_______ metals are based on iron. They are usually 2_______ with carbon because it increases the strength of iron and makes it much more useful to the engineer. Slight variations in carbon content can make very great differences in the properties of the 3_______. Wrought iron is a ferrous metal with carbon content of less than 0,05 %. Chains and 4_______ can be produced from this alloy.

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Heat causes some 1_______ to expand more than others. For example, copper expands more than iron. This 2_______ is used in the bimetal strip, which consists of two dissimilar strips of metal welded together. The strips are usually made of brass (an alloy of copper and zinc) and invar, a ferrous alloy which expands very little when heated.
An increase in 3_______ causes the brass to expand more than the invar. This expansion causes the bimetal strip to bend, and consequently a switch or a valve is 4_______.

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Heat causes liquids to expand. This effect is used in the 1_______. An increase in air temperature 2_______ the liquid to expand in the heat sensor. This expansion causes the valve to close and consequently the 3_______ of hot water is reduced.
After a time, the temperature will go down and the 4_______ will cool and contract. The spring load will now be greater than the liquid pressure and the valve will open. Once again, the hot water flow is increased.