Вопрос № 1072321 - Английский язык

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The plastics that were unknown only a few decades ago have become extremely important and widely used for construction purposes. The plastics being used nowadays possess many advantages. First of all they are extremely light and their tensile strength is greater than that of many metals. Besides, they are weather-resistant and resistant to attacks by industrial fumes and to a great number of chemical substances. Some of the examples of the constructive use of plastic materials have been domes housing radar antennae and electronic equipment. Such domes built in America and Canada are as high as 116 feet.
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Plastic Materials
1. Plastic materials are not found in nature. Plastic is formed by extrusion or injection molding under very high pressure. It can be molded into any desired shape. Organic plastics are divided into two general groups: thermosetting and thermoplastic. The thermosetting group becomes rigid through a chemical change that occurs when heat is applied. These plastics cannot be remolded. The thermoplastic group remains soft at high temperatures and must be cooled before becoming rigid. This group is not used generally as a structural material.
2. Plastics are rapidly becoming important construction materials because of their great variety, strength, durability and lightness. Plastics are light. The benefits of light weight coupled with good strength and absence of corrosion offer tremendous potential as alternatives to traditional building materials. A given volume of polythene weights less than one-eighth of an equal volume of iron and less than half of the same volume of aluminum.
3. Plastics are used in the industry and in the household: from rockets and electronics to toys and house ware. Plastic products offer many advantages over the materials they replace, such as ease of handling, lower maintenance costs and rapidity of assembly. The insulation and dielectric properties of plastics led to their early use in the electrical engineering industry, which was followed by special application in mechanical engineering.
4. Using of plastics as materials for a construction in the form of sheets, rods or tubes is substituting the conventional metals. Plastics offer a lot of properties for the designs. Plastics have now been developed to such an extent that they can be applied to almost every branch of building, from the laying of foundations to the final coat of paint.
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Why do plastics replace traditional building materials?

Установите последовательность пропущенных слов и выражений.
1) 1_______ flooring battens of the same wood.
2) Lay the parquet 2_______ only after all preparatory work has been done.
3) Parquet strips should be laid in the direction of the 3_______.
4) Every strip should be 4_______ toward the previously laid one.

Установите последовательность пропущенных слов и выражений.
1) Tiles should be laid 1_______ after the mastic has been applied.
2) 2_______ the tiles tightly to the subfloor.
3) Cut the tiles with a 3_______.
4) For a better adhesion tap the 4_______ into position with a rubber mallet.

Установите последовательность пропущенных слов и выражений.
1) Scratch, 1_______, and wash out the subfloor.
2) When making a floor with a rectangular 2_______ set the tiles parallel to the wall.
3) Apply 3_______ to the subfloor only for one course of tiles.
4) Lay the tiles to the 4_______design.

Установите последовательность пропущенных слов и выражений.
1) Before the first 1_______ is laid fix a string along the line of the course.
2) Nail the 2_______ strip down.
3) The 3_______ should be 60-70 mm long.
4) Saw the strips with a disc 4_______.