At __________________ should exist correct mains voltage.
A: the transforme
B: connecting transforme
C: disconnecting transforme
D: pre-disconnecting transforme
A: the transforme
B: connecting transforme
C: disconnecting transforme
D: pre-disconnecting transforme
举一反三
- At __________________ should exist correct mains voltage. A: the transformer B: connecting transformer C: disconnecting transformer D: pre-disconnecting transformer
- At __________________ should exist correct mains voltage.
- 5. Which of the following is not a way to avoid viruses? A: Use a firewall. B: Be careful about unknown messages C: Do not surf. D: Disconnecting from the Internet.
- There are two identical batteries in series, which statement is true?( ) A: The total voltage equals the sum of the voltages of each battery. B: The total voltage equals any battery voltage. C: The total voltage equals half of one battery voltage
- Mains voltage is sufficiently stable for the reactive power and within the range of_______________.