Вопрос № 911476 - Английский язык

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The combinations of two or more different materials are called composite materials. They usually have unique mechanical and physical properties because they combine the best properties of different materials. For example, a fibre-glass reinforced plastic combines the high strength of thin glass fibres with the ductility and chemical resistance of plastic. Nowadays composites are being used for structures such as bridges, boat-building etc.

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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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When you turn the handle of a water tap clockwise, the water stops. When you 1_______ it anticlockwise, the water pours out of the tap again. How does it work?
Look at FIG.2. The tap has a handle on the top and inside there is a 2_______, and a washer. The washer is over a hole.
When you turn the handle clockwise, this makes the bolt move downwards. The washer then covers the hole and stops the water.
When you turn the handle 3_______, the bolt moves upwards and the washer uncovers the hole again. This lets 4_______ flow through the tap again.

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As the population increases, the 1_______ of water supply in many desert regions becomes more urgent with every year.
Scientists 2_______ that the best way to solve this problem is to construct plants that will use atomic energy to distill fresh 3_______ from the sea. It is believed that it will be cheaper to distill sea water than to make 4_______ freshwater reservoirs.

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Some measuring 1_______ are fitted with dials. To prevent 2_______ readings, always read the dial correctly. Read the deal from 3_______ in front so that the reflection is behind the needle. If the 4_______ is not viewed from the front the reading will be incorrect.

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What does the bricklayer do first?
Watch the bricklayer. First, he picks up a brick. Then, he spreads mortar on it. Next, he puts the brick on the concrete. Then, he checks that it is level. Then, he picks up another brick…