Прочитайте текст и найдите соответствующий перевод подчеркнутого слова The single-process machine or...: ответ на тест 223853 - Английский язык

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The single-process machine or a tool with built-in auto-control can perform any process whenever it is fed with raw materials by the operator. It has its own source of power. An example is the automatic lathe in the use early in the 20th century.

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The single-process machine or a tool with built-in auto-control can perform any process whenever it is fed with raw materials by the operator. It has its own source of power. An example is the automatic lathe in the use early in the 20th century.

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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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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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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.