Прочитайте текст и найдите соответствующий перевод подчеркнутого слова The power may come for exampl...: ответ на тест 223852 - Английский язык

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The power may come, for example, from an animal as in the case of a horse-drawn cart, from wind as for the sailing ship and windmill. Here the man is fully responsible for controlling the system but he requires devices such as switches, pedals and steering wheels to control the power system.

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The power may come, for example, from an animal as in the case of a horse-drawn cart, from wind as for the sailing ship and windmill. Here the man is fully responsible for controlling the system but he requires devices such as switches, pedals and steering wheels to control the power system.

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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.