Завдання 4. Знайдіть речення, які відповідають змісту текста. 1. Nobody knows about the contribution, which scientists have made to mathematics, mechanical engineering

1. Nobody knows about the contribution, which scientists have made to mathematics, mechanical engineering, physics, chemistry and the theory of automatic control.

2. These are the areas of knowledge, which will make up the building of future.

3. The main task of these efforts is to solve social problems.

4. In the nearest future the traditional metalworking equipment will go through substantial changing employing automatic transport system and industrial robots.

5. The second line of scientific and technological progress is the greater durability of machines.

Завдання 5.Складіть речення з поданих слів.

1. the, of knowledge, these, of the future, the engineering, make up, will, are, areas, which.

2. intend, to increase, we, in science, nevertheless, and, technology, of progress, the speed.

3. man’s, to teach, the main, presence, to operate, machines, is, now, task, without.

4. developed, new, for, branches, technologies, have, of engineering, equipment, been, and, most.

5. able, the mode, to select, to control, of their, operation, they, of machining, the quality, own, and, be, should, also.

UNIT 5

Plastics.

Synthetic plastic materials are now being used in almost every type of industry for one purpose or the other. They are available in practically all colors and for almost all purposes where metal can be used, except where a very high degree of strength is required. They are lighter in weight than any common metal and are sufficiently hard to take the place of metal parts for most purposes.

Plastics are synthetic in the sense that they do not occur naturally. The molecules are composed principally of carbon, hydrogen and oxygen, which are derived from petroleum, coal, air and water. Their properties depend, to some extent, on the size of the molecules of which they are composed.

In the early stages of manufacture most plastics are monomers composed of small single molecules, but under appropriate temperature and pressure conditions or in the presence of chemical catalysts these small molecules combine to form long – chain molecules, which make up solid or semisolid structures. This process is called “polymerization”.

The modern plastics industry deals chiefly with materials manufactured from organic compounds.

Завдання № 1: Дайте відповідь на запитання.

1. Where are synthetic plastic materials being used?

2. What colors are they available in?

3. What do their properties depend on?

4. What is the process of “polymerization”?

5. What does plastics industry deal with?

Завдання № 2: Доповніть речення згідно зі змістом текста.

1. Plastic materials are lighter in weight than __________.

2. Plastics are synthetic in the sense that they do not ___________.

3. The molecules are composed principally of __________.

4. In the early stages of manufacture most plastics are monomers composes of __________.

5. The modern plastics industry deals largely with materials manufactured from _________.

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