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Прочитайте текст и заполните пропуски подходящими по смыслу словами Intensive 1______________ of rad...: ответ на тест 438824 - Английский язык

Прочитайте текст и заполните пропуски подходящими по смыслу словами
Intensive 1______________ of radio-location began in the early forties. All these years the vacuum tube was the heart of electronics and, hence, the field of electronics was usually 2_______________ as the study of the motion of electrons in vacuum tubes. However, it was found that small, controlled quantities of gas introduced into a "vacuum tube" could make it perform switching, 3______________ and other jobs. To include the category of gas-filled tubes, "vacuum tubes" became converted to "electron tubes" and the science of electronics was expanded to include the study of electron motion in  4______________.
Варианты ответов
  • gases
  • development
  • rectifying
  • defined
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Вопрос задал(а): Анонимный пользователь, 10 Ноябрь 2020 в 13:21
На вопрос ответил(а): Анастасия Степанова, 10 Ноябрь 2020 в 13:21

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