Variant I
2
2, :
1. that, one, it.
2. (The Passive Voice) - Indefinite, Continuous, Perfect.
3. to be, to have, to do.
4. . ) , ) , ) , ) .
5. .
.
1 ( . 3)
Present Perfect Passive
The main question has already been discussed.
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Present Indefinite Passive
His scientific work is much spoken about.
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2 ( . III)
1. It is necessary to use the latest means of control in industry. .
2. One should agree that that experiment was of great importance for our research. , .
3. It is hydrogen that will be the main source of energy in the car of the future. .
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1. , , that, one, it. , .
2. , , . , .
3. , , 3 to be, to have, to do. , .
6. . - .
1. magneto-heat engine - -
2. inexhaustible - ,
SUN-DRIVEN ENGINE
1. It is common knowledge that certain metals and their alloys are attracted by a magnet. After heating, this property vanishes; it is restored after cooling down. A new magneto-heat engine works on this principle. This invention relates to devices which transform thermal power, for instance, the power of the sun rays, into a mechanical power of rotation.
2. We know solar power is inexhaustible and its use does not harm the environment. That's why such importance is attached to the devices which make it possible to apply the idea of direct use of solar power, transforming it into mechanical forms of power. The development of an engine directly driven by a heat source such as solar power, makes it possible to simplify and make power generation considerably cheaper, in comparison to the existing thermal engines we use today.
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3. The rotor of the new engine is made of an alloy that loses its magnetic properties already at 100C. If the rotor is heated on one side, the cold side of the rotor will turn toward the magnet. Since heating continues, the rotor goes on rotating, too. Thus solar power can be used us a source of heat in this case. The magneto-heat engine can drive pumps in waterless districts, can also be widely used for watering greenery in cities and settlements.
4. B using thermomagnetic alloys it is possible to develop a lot of automatic devices, for example, solar clocks, thermometers, etc. Mention should be made that these devices can withstand extreme temperatures. To organize the production of the necessary alloys is simple as there is no need for rare materials or complex technology.
2. 4- . , : Why are thermomagnetic alloys used in the production of automatic devices?
1.... they resist to heat.
2.... they resist to pressure.
3.... they resist to acids.
3. , - - (. ). .
1. The research of planets will be developed with the help of cosmic apparatus.
2. This material is unaffected by solar radiation.
3/ When much had been done in the study of ecology by our institute it became an important scientific centre.
4. A curriculum of the new type of secondary school is offered by the Ministry of Education.
4. , it, that, one.
1. It was Einstein who came to the conclusion that the electromagnetic field is influenced by the gravitational field.
2. This metro station was opened last year, and that one will be put into operation in two years.
3. It is necessary to find new sources of cheap energy.
5. , to be, to have, to do.
1. Specialists do not use solar cells in industry as they are too expensive.
2. The engineers are to study the problem of using cosmic rays.
3. Man had to learn to obtain electric power directly from the Sun.
4. At present most of the industrial enterprises have their own electric power stations.
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1. They had equipped the laboratory with automatic machinery. 2. He is assembling the engine now. 3. Our engineers designed a new engine.
