Прочитайте текст и определите какой из заголовков соответствует тексту In algebra letters are used t...: ответ на тест 223770 - Английский язык

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.

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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Of great importance today is the subject of town planning. Throughout the nineteenth century in all industrial countries of the world the same thing occurred. In England, in the middle of the nineteenth century, one-half of the population lived in towns; the other half lived in the country. By the end of the century there were nearly a 20 million increase in the number of country dwellers.
Towns grew in a haphazard way. Houses were huddled together, and railways had found a way in, often to a most inconvenient part of the town. There was no plan in the arrangement of the town.
In Great Britain a Town Planning Act was passed in 1909, giving to local authorities, for the first time in history, power to develop their towns along scientific and artistic lines. After 1918, schemes of building on a national basis began in most countries.

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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 2_______. Although this is suitable for soft materials such as 3_______, a tool point with a small angle is too weak for hard materials. To cut metal, a stronger point is necessary, so the angle is greater at the point of a 4_______ chisel.

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To measure dimensions such as the length, height, depth or diameter of a component, micrometers are used. There are different types of micrometer for different 1_______.
To measure the external diameter of a small component such as a small shaft, a micrometer caliper is used; to measure internal 2_______, a micrometer cylinder is used. Depth micrometers are used to measure the 3_______ of a component. The measurements are shown on different 4_______ of scale depending on the type of micrometer.

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