Вопрос № 223106 - Английский язык

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Intensive 1______________ of radio-location began in the early forties. All these years the vacuum 2_______________ was the heart of electronics and, hence, the field of 3______________ was usually defined as the study of the motion of electrons in vacuum tubes. However, it was found that small, controlled 4______________ of gas introduced into a "vacuum tube" could make it perform switching, rectifying 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 gases.
Варианты ответов
  • tube
  • development
  • quantities
  • electronics
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Вопрос задал(а): Анонимный пользователь, 10 Ноябрь 2020 в 00:16
На вопрос ответил(а): Анастасия Степанова, 10 Ноябрь 2020 в 00:16