Прочитайте текст и определите какой из заголовков соответствует тексту All engineering materials are...: ответ на тест 800506 - Английский язык

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All engineering materials are divided into metals and  non-metals. Copper, cast iron, aluminium are examples of metals. Rubber, plastic and ceramics are examples of non-metals. Today different metals are widely used in machine-building industry.

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All engineering materials are divided into metals and  non-metals. Copper, cast iron, aluminium are examples of metals. Rubber, plastic and ceramics are examples of non-metals. Today different metals are widely used in machine-building industry.

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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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Wood used for construction purposes is usually changed into laminated wood or wood panel products. Large structural wooden members are produced by glueing small strips of wood together.
Wood in panel form is more advantageous for many building purposes than board. Why is it so? First of all, because wood panels are much easier to install than boards. They require much less labour for the process of installation. Besides, swelling and splitting in panels are greatly decreased compared with boards. As to plywood panels, they are made up of thin wooden veneers glued together. It is of great importance to note that when wooden structures are designed the future stresses of their structural members must be predetermined.

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In algebra, letters are used to express the general properties of numbers. Representing one number by the letter a and another by the letter b, we can write the equality.
                                   a x b=b x a
or, more shortly, ab=ba.
If no other sign is indicated, the multiplication sign is understood between any two letters written side by side.
To represent numbers letters of the Latin alphabet are generally used.

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A brick is best described as “a building unit”. It may be made of burnt clay, of concrete, of mortar or of a composition of sawdust and other materials; in shape it is a rectangular solid and its weight is from 61/2 to 9 lb.
The shape and convenient size of a brick enables a man to grip it with an easy confidence and, because of this, brick-building has been popular for many hundreds of years. The hand of the average man is large enough to take a brick and he is able to handle more than 500 bricks in an eight-hour working day.