Прочитайте текст и найдите соответствующий перевод подчеркнутого слова Trees are known to grow natur...: ответ на тест 800579 - Английский язык

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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_______.

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Wood belongs to naturally growing materials. It is known to be the oldest construction material and is still widely used for different purposes. Wood is popular since it has low weight and is easy to work. Besides, it grows naturally and is cheap. But its usage is limited because of its disadvantages: it easily burns and decays. As to stone, it also belongs to the oldest building materials. Among its disadvantages there are strength, high heat insulation and fire-resistance.

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Because of its many advantages timber is highly used for producing window and floor frames, for flooring and roofing and for other various woodwork. The two main types of timber are hardwoods and softwoods. Of them, hardwoods are popular as materials used for decorative purposes: veneering in furniture and paneling. As to softwoods, they are mainly used for producing window and door frames and other kinds of woodwork.

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Metals began to be widely used as construction materials not so long ago. Before the beginning of the nineteenth century metals played little structural role in the process of building. Mostly they served for joining parts of buildings. The ancient Greeks and Romans are known to use bronze for joining slabs of stone.

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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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There exist different ways of producing concrete. It can be produced by mixing the ingredients and pouring the mixture into position on the very site of building. Concrete can also be produced in a factory, and used as a material for manufacturing prefabricated blocks. Accordingly, there exist the so-called in-situ (cast-in-place) concrete and precast concrete.