shams200108

25.03.2020 06:54

Английский язык

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1. переведите текст письменно. 2. составьте 10 вопросов к тексту (5 вопросов к предложению в активном залоге, 5 вопросов к предложению в пассивном залоге). 3. составьте словарь терминов, которые встретились в вашем тексте. вариант 6. non-ferrous metals are more expensive than ferrous metals and are used only when some characteristic not possessed by iron or steel is essential or desirable in application. these characteristics are: high electrical and thermal conductivity, high corrosion resistance, non-magnetic qualities, light weight, etc. the metals most frequently used to make non-ferrous metal castings are copper, tin, zinc, lead, nickel, gold and aluminium. some of the basic non-ferrous metals and their characteristics are described below. copper is a reddish-brown, tough metal. it has very high electric conductivity and high corrosion-resistant qualities. copper is used for making electrical contacts and wires, pipes, telephone cables, tanks, water heaters, etc. zinc is a hard, brittle, bluish-white metal that is employed in the pure form as sheet zinc. lead is a very heavy bluish-grey metal which is very soft. this metal is highly resistant to corrosion, but its strength is so low that it must be supported by a core of some other metal. lead is used for lining pipes, acid tanks and coating electrical cables. aluminium is a soft, silvery white metal. it is light weight, has high corrosion-resistant qualities and is used for automobile and airplane parts as well as for making different light-weight objects used in everyday life such as: frames, cooking utensils, chairs, etc.