Прочитайте текст и заполните пропуски подходящими по смыслу словами. Concrete being a universally us...: ответ на тест 911997 - Английский язык

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Concrete being a universally used material, its new kinds are being constantly produced. Among others there exists concrete with cells. Its main quality is that it is made of materials that emit gas and foam during the process of mixing the aggregates with water. It should be taken into account that concrete of this type possesses relatively light weight. It is mostly used for producing slabs, wall panels, and frame constructions. As we know, decrease in weight leads to a considerable decrease in strength. This quality is classified as a great disadvantage of cellular concrete.

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Concrete being a universally used material, its new kinds are being constantly produced. Among others there exists concrete with cells. Its main quality is that it is made of materials that emit gas and foam during the process of mixing the aggregates with water. It should be taken into account that concrete of this type possesses relatively light weight. It is mostly used for producing slabs, wall panels, and frame constructions. As we know, decrease in weight leads to a considerable decrease in strength. This quality is classified as a great disadvantage of cellular concrete.

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The quality of 1_______ 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 2_______ construction there are plain concrete and reinforced, or ferro-concrete. The usage of plain concrete is practically 3_______. As to ferro-concrete, it is mostly used for construction of foundations, 4_______, girders and beams. This kind of concrete is also rather popular for constructing bridges, dams and dock walls.

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Plywood 1_______ materials are widely used in modern construction business. They are 2_______ because of their light weight and their relative cheapness. The cost of the material per unit area of wall is usually less than for other siding materials. Besides, the labor costs are also relatively low. The reason for it is the fact that large 3_______ of plywood are more quickly installed than the boards of the same area. In many cases, if it is necessary, the sheathing can be eliminated from the building if 4_______ is used for siding. This operation, if it is performed, leads to further cost saving.

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Wood belongs to naturally growing 1_______. It is known to be the oldest construction material and is still widely used for different 2_______. Wood is popular since it has low 3_______ and is easy to work. Besides, it grows naturally and is cheap. But its 4_______ is limited because of its disadvantages: it easily burns and decays. As to stone, it also belongs to the oldest building materials. Among its disadvantages there are strength, high heat insulation and fire-resistance.

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Timber belongs to one of the oldest building materials. It has been from ancient times and is still produced from 1_______ wood. Timber has always been highly usable in construction because of its many advantages. To these belong its strength, light weight, cheapness, and high 2_______. Its other advantage is that it belongs to natural resources and is naturally renewable. It is the more so that about a third of the world is still considered to be covered with forests. Besides, timber is resistant to corrosion produced by 3_______ substances in the modern polluted atmosphere. One more advantage of timber is that it can be used for many construction 4_______.