Прочитайте текст и выберите утверждение соответствующее содержанию текста The combination of metals ...: ответ на тест 607652 - Английский язык

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The combination of metals and non-metals is known as an alloy. For example, steel is an alloy of iron and carbon. The alloy of copper and zinc is known as brass. The properties of alloys are often better than the properties of their constituents. That is why the majority of engineering products are made of various alloys.

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The combination of metals and non-metals is known as an alloy. For example, steel is an alloy of iron and carbon. The alloy of copper and zinc is known as brass. The properties of alloys are often better than the properties of their constituents. That is why the majority of engineering products are made of various alloys.

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There is a lot of carbon (about 85%) in diesel fuel. There is also a lot of carbon in petrol. There is a little sulphur (about 1%) in diesel fuel and there is no sulphur in petrol. There is a great deal of petrol (about 95%) and a little oil (about 5%) in the fuel mixture for two-stroke engines. There is no oil in the fuel for four-stroke engines. There is a great deal of air (90%) and not much fuel (10%) in the fuel and air mixture.

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Copper is a red metal. It is harder and stronger than aluminium and more flexible than steel. Electric wires are generally made of copper because this metal has a high electric conductivity. However, copper is heavier than aluminium and steel.

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Nowadays machine tools play an important role in the manufacture of almost all metal products. Machinists (people who operate machine tools) use them in making automobiles, radios, refrigerators, television sets and so on. Every mechanical engineering workshop is equipped with machine tools.

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The roof is a necessary component of practically every building. It serves to protect the interior of the building from rain, snow, wind, and cold. There exist many types of roofs, the main ones being sloping (pitched) roofs and flat (or nearly flat) ones.