Прочитайте текст Nowadays suspended ceilings have become a very popular and economical feature in ma...: ответ на тест 800617 - Английский язык

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Nowadays suspended ceilings have become a very popular and economical feature in many types of buildings. The most numerous among these buildings are office and laboratory structures. Many of them install and maintain complex mechanical and electrical installations above the ceiling. These installations include air conditioning ducts, water and waste piping and electrical and communications wiring. They also include such services as fume ducting, vacuum piping, fuel gas lines, compressed air lines, water piping, and chemical waste piping. All these ducts and pipes occupy a considerable space in the building. In some of them they may be equal to the amount of their living space.  
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All these ducts and pipes _______.
Варианты ответов
  • occupy a considerable space in the building.
  • have become a very popular and economical feature in many types of buildings.
  • are office and laboratory structures.
  • are very numerous.
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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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