Вопрос № 912009 - Английский язык

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Concrete is produced by combining coarse and fine aggregates, Portland cement, and water. Coarse aggregate is generally gravel or crushed stone, and fine aggregate is sand. Cement, sand, gravel, and water are taken in proportional amounts and mixed. The quality of concrete depends mostly on the quality of the cement used. The process of production consists in pouring the mixed components into forms and holding them until they harden. The process of hardening generally lasts about 28 days.

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Concrete is produced by combining coarse and fine aggregates, Portland cement, and water. Coarse aggregate is generally gravel or crushed stone, and fine aggregate is sand. Cement, sand, gravel, and water are taken in proportional amounts and mixed. The quality of concrete depends mostly on the quality of the cement used. The process of production consists in pouring the mixed components into forms and holding them there until they harden. The process of hardening generally lasts for about 28 days.
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What does the quality of concrete depend on?

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Brick, stone, and timber are known to be the oldest building materials. Bricks belong to artificial (man-made) materials. Their production started in prehistoric times. Since then they have been produced and tested in all types of climate and in many countries. Thousands of years ago the builders in Egypt already knew the advantages of bricks and used them for construction. In those days the production of bricks was quite different from the modern one. Bricks were produced not by burning but by drying in the sun, as it was much sunshine in Egypt all the year round. Brick work was also popular in Rome, there being very few growing forests and as a result little timber there.

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Nails are generally made of plain steel. It is of interest to note that steel used for nails is uncoated steel. Practically, nails are sharpened metal pins driven into wood with a hammer or a mechanical nail gun. There exist different types of nails. Among them common nails and finish nails are the two types most frequently used for fastening. Common nails have flat heads and are used for most structural connections in light framing constructions. The main property of finish nails is that they are headless. Finish nails are used to fasten finish wood work.

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Nowadays suspended ceilings have become a very popular and economical feature in many types of buildings. 1_______. Many of them install and maintain complex mechanical and electrical installations above the ceiling. These installations include air conditioning ducts, water and waste piping and electrical and communications wiring. 2_______. All these ducts and pipes occupy a considerable space in the building. In some of them they may be equal to the amount of their living space.
3_______. Lighting fixtures, loudspeakers, and fire detection devices may also be installed into a ceiling. 4_______.

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Being the oldest building material, wood is also known to be the only naturally growing organic material. 1_______? Hardly so, because wood always contains some water which decreases its strength. 2_______. It is a well-known fact that the drier is the cut wood the greater is its strength and hardness.
Trees are known to grow naturally, which makes wood a constantly renewable natural resource. 3_______. But, as any other construction material, wood has its disadvantages. The main ones are the following – it is not fire-resistant, it easily burns. 4_______.