Прочитайте текст Concrete is the name of artificial stone. The materials from which concrete is form...: ответ на тест 848134 - Английский язык

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Concrete is the name of artificial stone. The materials from which concrete is formed are sand, pieces of broken stone and cement mixed with water in suitable proportions. These materials are called ingredients of concrete. The sand and broken stone form the skeleton of concrete. Dry cement is an inert powder, but on the addition of water a chemical reaction takes place.
This causes the whole mix to set and harden forming a solid mix.
Water used in concrete mix is ordinary drinking water. It must be free from any impurities. The amount of water added influences the properties of concrete. Concrete products must be manufactured according with existing standards. Having chosen component materials builders must be well familiar with technology of concrete and use them in correct proportions.
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Which materials form the skeleton of concrete?

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Concrete is the name of artificial stone. The materials from which concrete is formed are sand, pieces of broken stone and cement mixed with water in suitable proportions. These materials are called ingredients of concrete. The sand and broken stone form the skeleton of concrete. Dry cement is an inert powder, but on the addition of water a chemical reaction takes place.
This causes the whole mix to set and harden forming a solid mix.
Water used in concrete mix is ordinary drinking water. It must be free from any impurities. The amount of water added influences the properties of concrete. Concrete products must be manufactured according with existing standards. Having chosen component materials builders must be well familiar with technology of concrete and use them in correct proportions.
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Which materials form the skeleton of concrete?

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1 _______. The first lifts, or ‘elevators’ in American English, consisted of a platform suspended from a rope which passed over a pulley at the top of the building. If the rope broke, the platform fell to the ground. 2 _______. If the rope broke, a brake was applied automatically which locked the platform in place between guide rails. 3 _______. Most lifts today are roped lifts. The car runs between vertical guide rails keep it steady and act as a safety device. Steel ropes, or cables, attached to the roof of the car pass over a pulley, called the drive sheave, which is turned by an electric motor. 4 _______. This matches the weight of a car with an average load of passengers.
The counterweight saves energy. Its weight helps to raise the car. In the same way, the weight of the car when it descends helps to raise the counterweight. For the most part, the motor only has to overcome friction.

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1 _______. The first lifts, or ‘elevators’ in American English, consisted of a platform suspended from a rope which passed over a pulley at the top of the building. If the rope broke, the platform fell to the ground. 2 _______. If the rope broke, a brake was applied automatically which locked the platform in place between guide rails. 3 _______. Most lifts today are roped lifts. The car runs between vertical guide rails keep it steady and act as a safety device. Steel ropes, or cables, attached to the roof of the car pass over a pulley, called the drive sheave, which is turned by an electric motor. 4 _______. This matches the weight of a car with an average load of passengers.
The counterweight saves energy. Its weight helps to raise the car. In the same way, the weight of the car when it descends helps to raise the counterweight. For the most part, the motor only has to overcome friction.

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