Прочитайте текст и найдите соответствующий перевод подчеркнутого слова Concrete is produced by combi...: ответ на тест 800582 - Английский язык

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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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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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There exist different ways of producing concrete. It can be produced by mixing the ingredients and pouring the mixture into position on the very site of building. Concrete can also be produced in a factory, and used as a material for manufacturing prefabricated blocks. Accordingly, there exist the so-called in-situ (cast-in-place) concrete and precast concrete.

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1______________. It is more than 20 kilometres long. 2___________. They started on opposite sites and met in the middle under the sea. They used specially-designed tunnel boring machines (TBMs) to dig the tunnels through the rock under the seabed. 3____________. The machines used to dig the main tunnels were about 8.5 metres in diameter and 250 metres long. Work started in 1987 and the teams met under the seabed in 1991.4___________.

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The Tay Bridge in Scotland was designed and built by Sir Thomas Bouch. 1_______. The bridge, which was over 3 kilometres long, opened in 1878 and fell down in a winter storm in 1879. 2_______.
There was the enquiry into the Tay Bridge disaster to find out why the accident happened. One of the constructions was that the design and construction were based on quickly and cheaply it could be built. Safety and strength were not thought about properly. 3___________ . Also, the design was based on experience rather than the more scientific and accurate calculations used today. 4___________. The results confirm that the design of the bridge was definitely substandard.

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Engineering is everywhere. 1________. For example, if a manufacturer wants a faster car, a smaller personal stereo, or a better pen, they will ask a design engineer to find a practical solution.
Engineering is both theoretical and practical. 2________. The design solution must be a reasonable price, safe, and reliable. A new idea that is expensive, dangerous, or doesn’t always work is not a good solution.
Engineers use a method. Generally, engineers solve problems in a methodical way.
Engineers:
1. 3________,
2. design a solution,
3. rest the solution,
4. evaluate the solution.
4________. When a good solution is found, the next step is to:
     5. communicate the solution.