CATEGORY A EPIRB’s transmit on frequencies that are monitored by（）.
A: orbiting satellites in space
B: commercial radio stations
C: private，commercial，and military aircraft
D: ordinary radio statio
A: orbiting satellites in space
B: commercial radio stations
C: private，commercial，and military aircraft
D: ordinary radio statio
举一反三
- Channel A: a word that indicates a response is not required B: a range of frequencies used by a particular station to transmit radio messages
- Sensors in your smart car tuned to radio signals from orbiting satellites can l_______________ your car precisely and warn of traffic jams.
- Sensors in your car tuned into radio signals from orbiting satellites can locate your car _________ at any moment and warn of traffic jams.
- Sensors in your car _____ to radio signals from orbiting satellites can locate your car precisely at any moment and warn ______traffic jams.
- Public television stations are different form commercial stations _____.