Вопрос из теста по предмету Английский язык

Question

Определите основную идею текста

Answer

The grid is the most important component in the transistor.

Answer

Vacuum tubes and transistors are the main matters of interest in the instrument-making industry nowadays.

Answer

Modern portable radios are better than big tube radios.

Answer

Vacuum tubes and transistors both are basically amplifiers, but transistors are more technically advanced and better in use.

Определите основную идею текста: ответ на тест 804735 - Английский язык