Вопрос № 348039 - Английский язык

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     In algebra, letters are used to express the general properties of numbers.
     Representing one number by the letter a and another by the letter b, we can write the equality.
                                   a x b=b x a
or, more shortly, ab=ba.
     If no other sign is indicated, the multiplication sign is understood between any two letters written side by side.
     To represent numbers letters of the Latin alphabet are generally used.

Прочитайте текст и определите, какой из заголовков соответствует тексту
In algebra, letters are used to express the general properties of numbers. Representing one number by the letter a and another by the letter b, we can write the equality.
                                   a x b=b x a
or, more shortly, ab=ba.
If no other sign is indicated, the multiplication sign is understood between any two letters written side by side.
To represent numbers letters of the Latin alphabet are generally used.

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There are 1_______ types of chisel for metalwork and for woodwork. Woodwork chisels have a smaller angle at the point of the tool Although this is suitable for soft materials such as 2_______, a tool point with a small 3_______ is too weak for hard materials. 4_______ metal, a stronger point is necessary, so the angle is greater at the point of a metalwork chisel.

Прочитайте текст и заполните пропуски подходящими по смыслу словами 1_______ metals are based on iron. They are usually 2_______ with carbon because it increases the strength of 3_______ and makes it much more useful to the engineer. Slight variations in carbon content can make very great differences in the properties of the metal. Wrought iron is a ferrous metal with carbon content of less than 0,05 %. Chains and 4_______ can be produced from this alloy.

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Riveting is a 1_______ of joining metals 2_______. The process consists of drilling or punching the metal plates, inserting the rivet and then 3_______ it by compression force. There are several standard 4_______ of rivet heads with different uses.

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Man has always tried 1_______ his standard of living by changing his surroundings and by making tools to simplify the everyday tasks necessary for his existence. At first, the only 2_______ he could use were those he could see around him – stone, wood and so on. He survived in competition with other animals because of his abilities with his 3_______ and their coordination with his brain. Because he did not have 4_______ and speed of some animals, his survival depended on his skillful use to get food and to keep him warm and safe.