Прочитайте текст. Generally the load on roofs consists of two components: the snow load and the wind...: ответ на тест 1105251 - Английский язык

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Generally the load on roofs consists of two components: the snow load and the wind-pressure. The action of these loads is quite different on flat roofs and pitched ones. The snow load on flat roofs is great; practically it is at the maximum. As to the wind pressure on roofs of this type, it is very small – practically it is at the minimum. On pitched roofs the situation is different; when the pitch of the roof increases the weight of the snow load decreases. As to the wind pressure, it increases with the increase of the pitch.
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What components does the load on roofs consist of?

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Generally the load on roofs consists of two components: the snow load and the wind-pressure. The action of these loads is quite different on flat roofs and pitched ones. The snow load on flat roofs is great; practically it is at the maximum. As to the wind pressure on roofs of this type, it is very small – practically it is at its minimum. On pitched roofs the situation is different; when the pitch of the roof increases the weight of the snow load decreases. As to the wind-pressure, it increases with the increase of the pitch.
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On pitched roofs when the pitch of the roof increases the weight of the snow load …

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The new concrete pipe being manufactured may be classified as the benchmark of industry. Among other excellent qualities, it possesses the highest structural strength compared with any sanitary sewer. What are the main characteristics of the pipe that make it so popular? These are advanced concrete mix design, and steel reinforcement. High quality manufacture processes allow the pipe to be used in any site conditions, from shallow fills to deep bury situations. Strength, concrete’s pipe’s durability and its versatility are the main properties that are combined in the pipe. They produce the technology one can trust.
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What do high quality manufacture processes allow?

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Plywood siding materials are widely used in modern construction-business. They are popular 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, labor costs are also relatively low. The reason for it is the fact that large sheets 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 plywood is used for siding. This operation, if it is performed, leads to further cost saving.
It should be taken into account that usually plywood sidings must be painted in order to save them for decay. But if they are produced from decay-resistant material, they can be left to weather effects without the surface coverage.

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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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Cladding is a material used as the exterior wall enclosure of a building. The cladding of a building is its most visible part. Its major purpose is to separate the indoor environment of a building from the outdoors. Cladding must prevent the entry of water, snow and ice into a building. Water on the face of a building is known to be driven by wind not only in a downward direction, but in every other direction, even upward. Water problems, that is keeping water out, are especially great on very tall buildings. These buildings rise to height where wind velocities are extremely high. They are much higher than at ground level. It should be taken into account that on tall buildings water tends to penetrate the smallest crack or hole and enter the building.