Вопрос № 34423 - Английский язык

Установите последовательность пропущенных в тексте слов.
The roof is a necessary component of practically every 1_______. It serves to protect the interior of the building from rain, snow, wind, and cold. There exist many types of 2_______, the main ones being sloping roofs and flat ones. It is a well-known fact that every roof should 3_______a covering. The type of covering of a roof mainly depends on the 4_______ of the roof and some other factors.

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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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Composite Materials
1. Among the oldest and newest of structural materials are composite materials. It was discovered many years ago that two or more materials could be used together as one. Later it was proved that such a combination often behaved better than each material alone. Following this principle, clay and straw were combined to make bricks. For centuries composite materials remained virtually untapped. Only then monolithic materials, such as iron, copper were served for needs of an advancing technology. Recently it was a development of technology with coming of reinforced concrete, linoleum, plasterboard and plywood panels.
2. During the 1930s and 1940s light-weight honeycomb structures, machine parts made from compressed metal powders and plastic reinforced with glass fibers became commercial realities. These developments marked the beginning of the modern era of composite engineering materials. It was mentioned growing and using composite materials. Nevertheless, the emergence of a strict discipline and technology of composite materials is barely 20 years old.
3. There are two major reasons for the current interest in composite materials. The first is the demand for materials that will outperform the traditional monolithic materials. The second and more important in the long run, is that composites offer engineers the opportunity to design totally new materials, with the precise combination of properties needed for a specific task. Although new composites are usually more costly than conventional materials, they can be used more sparingly, because of their superior qualities.
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Engineers insist on using composite materials despite their high cost because …

The largest known living animals are whales and _________.

The fire will go ________ unless you put some more wood on it.

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Professor: «I invite you to take part in our scientific conference to be held next week».
Student: «_________________»