Вопрос из теста по предмету Английский язык

Question

Ответьте на вопрос:

What served as a major semiconductor material before silicon?

Answer

Photodiodes were widely used as semiconductors before silicon was discovered.

Answer

In the 1960’s silicon replaced germanium, which was the major semiconductor material until then.

Answer

Any simple metal was used for mass production of semiconductors.

Answer

Silicon was the first material used as a semiconductor, it didn’t have any predecessor.

Ответьте на вопрос: What served as a major semiconductor material before silicon: ответ на тест 804726 - Английский язык