Timber is wood suitable for building and structural 1 ______. There are over 4000 2 ______ in commo...: ответ на тест 800542 - Английский язык

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Because of its many advantages timber is highly used for producing window and floor frames, for flooring and roofing and for other various woodwork. The two main types of timber are hardwoods and softwoods. Of them, hardwoods are popular as materials used for decorative purposes: veneering in furniture and paneling. As to softwoods, they are mainly used for producing window and door frames and other kinds of woodwork.

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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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We build because we need shelter. We need shelter from sun, rain, wind and snow. Not much that modern people do takes place outdoors. Our activities mostly take place indoors. For these activities we may need air that is warmer or cooler than the air outdoors. We may also need less light by day and more light by night than is provided by nature.
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Why do we build?

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The Empire State Building was built in 1931 in the United States of America. Its construction took about two years. The exterior of the sky-scraper is supported by a framework produced of steel. It should be noted that 60,000 tons of steel were used for its production. The Empire State Building is considered to be one of the tallest and spacious constructions of the world. It can be attended by 80,000 people simultaneously.
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How much time did the construction of the Empire State Building take?

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The quality of concrete is known to depend on the properties of materials it consists of. The amount of constructing materials is also of great importance. Among the kinds of concrete used in modern construction there are plain concrete and reinforced, or ferro-concrete. The usage of plain concrete is practically limitless. As to ferro-concrete, it is mostly used for construction of foundations, columns, girders and beams. This kind of concrete is also rather popular for constructing bridges, dams and dock walls.
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The usage of what construction material is practically limitless?

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There are different shapes. They are triangles, squares, rectangles and circles.
Triangles have three sides and three angles. Squares and rectangles have four sides. Squares have four equal sides, but rectangles have two equal sides. Circles do not have angles and sides.
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How many equal sides do squares have?