Вопрос № 223855 - Английский язык

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Building construction has its own history, which is marked by a number of trends. Let’s describe some of them. One of these trends is increasing durability of the materials. The first building materials were perishable. We mention leaves, branches and animal hides. Later people began to use more durable natural materials such as clay, stone, timber. Finally, synthetic materials such as bricks, concrete, metals, plastics were used in building.

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However, the materials that helped him most to develop were the metals. Their characteristics of the strength coupled with the ease with which they can be shaped made metals of vital importance in the technology of the past. The exploitation of other properties, such as electrical and thermal conductivity, made it possible to develop high technologies appropriate to the fields of space travel, communications and nuclear engineering.

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However, the materials that helped him most to develop were the metals. Their characteristics of the strength coupled with the ease with which they can be shaped made metals of vital importance in the technology of the past. The exploitation of other properties, such as electrical and thermal conductivity, made it possible to develop high technologies appropriate to the fields of space travel, communications and nuclear engineering.

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The first materials which man discovered were copper and gold, because they occur naturally in the pure state. They were used because they could be shaped easily, gold being especially soft. The discovery that copper could be obtained in sufficient quantities for beating into vessels and weapons was an important step in the use of metals, but the discovery that copper ore would produce copper was probably accidental.

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Copper had been smelted and used for two thousand years before the potential of iron become evident. In the course of smelting activities, no doubt iron ores and the substance resulting from smelting them were encountered.

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Machine-tools are machines designed for cutting metal by means of a cutting tool. The machine-tool comprises the principle manufacturing equipment in a machine shop. It is the original source of every manufactured article we use or touch. It can not only produce itself but it is the only machine which can create other machines.