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Прочитайте текст Mixing small wires with enlarged ends into concrete increases the material’s streng...: ответ на тест 800614 - Английский язык

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Mixing small wires with enlarged ends into concrete increases the material’s strength and hardness, according to research performed at the National laboratory, Los Alamos, New Mexico.
Researchers found that when bone-shaped wires 25 mm long were added in amounts equal to just 1 percent of the concrete’s volume, the strength increased by as much as 84 percent. The concrete was also 93 times harder.
Straight steel wires have been used to reinforce concrete for several decades. But wires of this kind bond only weakly with the concrete at their ends. Besides, it turned out that straight wires can also snap under high stress without much bending or stretching. In stress tests concrete containing the wires with bulbous ends became even stronger after the first cracks appeared as the load was transferred to the wires.
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Straight steel wires have been used _______.
Варианты ответов
  • to reinforce concrete for several decades.
  • under high stress without much bending or stretching.
  • at the National laboratory, Los Alamos, New Mexico.
  • in stress tests.
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Вопрос задал(а): Анонимный пользователь, 13 Ноябрь 2020 в 01:37
На вопрос ответил(а): Анастасия Степанова, 13 Ноябрь 2020 в 01:37

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