题目内容

Which one is conductor in the following materials?

A. silicon
B. quartz
C. glass
D. copper

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At room temperature, the barrier potential of silicon is ________.

A. 0.7V
B. 0.3V
C. 0.5V
D. 1V

Oxygen is first in abundance of the Earth’s crust.

The rapid multiplication of conduction-band electrons, known as a zener effect, results in a rapid buildup of reverse current.

Pierre de Fermat enunciated the celebrated Principle of Least Time.

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