Вопрос № 223853 - Английский язык

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The lathe is a machine-tool in which work is held so that it can be rotated about the axis. The cutting tool is traveled past the work from one end to the other. It is designed primarily for turning and boring operations. However, in addition to turning and boring, many other operations may also be performed on a lathe. The lathe is considered to be the oldest but still the most important of all machine-tools. Any shop, containing machines or machine-tools, contains a lathe.

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The lathe is a machine-tool in which work is held so that it can be rotated about the axis. The cutting tool is traveled past the work from one end to the other. It is designed primarily for turning and boring operations. However, in addition to turning and boring, many other operations may also be performed on a lathe. The lathe is considered to be the oldest but still the most important of all machine-tools. Any shop, containing machines or machine-tools, contains a lathe.

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Level 5 is the robot. This is the system which is powered and programmed to produce a succession of identical products or carry out a series of similar operations. The human can instruct the robot to vary its actions in accordance with variations which it observes in the surrounding situation.

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Since the Stone Age, man has found many more materials that he can work with to his advantage. His ingenuity has led him to discover the potential of many natural products. However, the materials that helped him most to develop were the metals.

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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.