Прочитайте текст. Concrete is produced by combining coarse and fine aggregates Portland cement and w...: ответ на тест 1072302 - 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 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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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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The traditional frame material for windows is wood. But in the last decades aluminum, steel, plastic and combination of these materials are also commonly used. Wood is known to be a good thermal insulator and is extremely workable. It is easily turned into sashes. But its disadvantage is that it shrinks and swells when the weather conditions change.
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What is the disadvantage of wood as a frame material?

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Many connections in wood structures depend on direct bearing of one member of the structure on another for their strength. Various simple fasteners are used for constructing purposes. Of them wood fasteners include nails, screws, bolts, anchors and some others. Nails are generally made of plain steel. It is interesting to note that steel used for nails is uncoated steel. There exist different types of nails. Among them common nails and finish nails are the two types most frequently used for fastening.
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What are nails generally made of?

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Practically every modern building is supplied with stairways of some kind. A stairway is designed to provide a means of access between different floor levels of a building. Nowadays stairways are produced of various construction materials but the most popular among them are timber and reinforced concrete. Of them timber may be used for domestic stairs of all kinds because of its economical availability. As to reinforced concrete it is popular because of its durable qualities, great resistivity to decay and great resistance to fire.
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Why are stairways produced of reinforced concrete so popular?

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What kinds of loads are supported by foundations? A foundation may support different kinds of loads. Among them there are dead loads and live loads. The dead load of a building includes the weights of the ceilings, the frame, the floor, roofs and walls. Besides every modern building is known to have water, electricity, heating, ventilation and dispose of waste systems and, accordingly, their equipment. The dead load also includes the weights of this electrical and mechanical equipment and the weight of the foundation itself. As to the live load, it includes the sum of the weights of the people and other living beings, the furnishings, and equipment they use. The live load also includes snow, ice, and water of the roof.
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What are the loads supported by foundations?