Engine 2014: Electricity

1. A The semiconductor diode is smaller in size, has no warm-up time, and is less reliable than the vacuum tube diode.
2. B The semiconductor diode is smaller in size, has significant warm-up time and is more reliable than the vacuum tube diode.
3. C The semiconductor diode is larger in size, has no warm-up time and is more reliable than the vacuum tube diode.
4. D The semiconductor diode is smaller in size, has no warm-up time and is more reliable than the vacuum tube diode.

Tip: press A-D to answer