Прочитайте текст Many of the robots today perform different jobs. Robots are used in various branche...: ответ на тест 607549 - Английский язык

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Many of the robots today perform different jobs. Robots are used in various branches of industry. A modern robot is a complex structure with a number of components. Each of them performs a certain task. Scientists have developed new models of robots. Such robots are used for various purposes.
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What have scientists developed?

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Many of the robots today perform different jobs. Robots are used in various branches of industry. A modern robot is a complex structure with a number of components. Each of them performs a certain task. Scientists have developed new models of robots. Such robots are used for various purposes.
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What have scientists developed?

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Concrete is produced by combining coarse and fine aggregates, Portland cement, and water. Coarse aggregate is generally gravel or crushed stone, and fine aggregate is sand. Cement, sand, gravel and water are taken in proportional amounts and mixed. The quality of concrete depends mostly on the quality of the cement used. The process of production consists in pouring the mixed components into forms and holding them there until they harden. The process of hardening generally lasts for about 28 days.
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What does the quality of concrete depend on?

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What is a crystal? A crystal is a geometrical solid made by a natural process. Many substances absorb water from solutions when they crystallize; that is, they unite chemically with a definite proportion of water. The water with which any substance unites during the process of crystallization is called the water of crystallization.
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What is a crystal?

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Aluminium, water, oxygen, and carbon dioxide are substances. Some substances are elements and some substances are compounds. Elements have only one type of atom whereas compounds have more than one type.
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How many types of atom do elements have?

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Boats on canal go through locks to move up or down from one level to another. The locks have large lock gates to let the boats in and out. They also have smaller sluice gates; these open and close to control the water level. The scale on the side shows the depth of the water in metres.
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What does the scale on the side of the lock show?