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Вопрос № 223940 - 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.
Варианты ответов
  • One of the main characteristics of ferrous metals is high corrosion resistance.
  • Steel, iron and copper are widely used for making tools.
  • Steel is an alloy of iron and carbon.
  • All engineering materials are divided into metals and non-metals.
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Вопрос задал(а): Анонимный пользователь, 10 Ноябрь 2020 в 00:17
На вопрос ответил(а): Анастасия Степанова, 10 Ноябрь 2020 в 00:17

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Вопрос № 132485

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The value of alloys was discovered in very ancient times; brass (copper and zinc) and bronze (copper and tin) were especially important. Today the most important are alloy steels, which have a lot of special characteristics.
In some years the most important will be alloy steels.
Today the most important is brass.
Some years ago the most important were alloy steels.
Today the most important are alloy steels.

Вопрос № 850532

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We can divide all metals into ferrous and non-ferrous. Steel and cast iron are in the group of ferrous metals. They are alloys of iron with carbon, manganese, silicon and other components.
Non-ferrous metals are metals and alloys the main component of which is not iron but some other element such as aluminium, copper and others. Some of the characteristics of non-ferrous metals are high electric and heat conductivity, high corrosion resistance, light weight and easiness of fabrication.
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Alloys
Heat Conductivity
Ferrous and Non-ferrous Metals

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Вопрос № 223941

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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.
Petrol has a low percentage of carbon.
There is too much sulphur in petrol.
A lot of motor vehicles have petrol engines.
There is a lot of carbon in petrol.

Вопрос № 223942

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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.
Aluminium is a white hard metal.
Steel is a grey elastic metal.
Aluminium is the most flexible material.
Copper is heavier than aluminium and steel.

Вопрос № 223943

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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.
A toolboard is in the middle of the workshop.
A new machine tool had been devised by the end of the week.
There are about 500 kinds of machine tools.
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Вопрос № 223944

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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.
The type of covering of a roof mainly depends on the form of the roof.
Pitched roofs have their disadvantages.
As to flat roofs, they can cover very broad buildings.
There exist many types of roofs.
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