Engine 2014: Electricity

1. A The semiconductor diode has shorter life, no warm-up time, and is less delicate than the vacuum tube diode.
2. B The semiconductor diode has longer life, no warm-up time, and is more delicate than the vacuum tube diode.
3. C The semiconductor diode has longer life, no warm-up time, and is less delicate than the vacuum tube diode.
4. D The semiconductor diode has longer life, longer warm-up time and is less delicate than the vacuum tube diode.

Tip: press A-D to answer