According to ICAO, a distress message on 121.5 Mhz should begin with _______.
A.MAYDAY MAYDAY MAYDAY
B.PANPAN PANPAN PANPAN
C.HELP HELP HELP
D.SOS SOS SOS
正确答案是A
According to ICAO, a distress message on 121.5 Mhz should begin with _______.
A.MAYDAY MAYDAY MAYDAY
B.PANPAN PANPAN PANPAN
C.HELP HELP HELP
D.SOS SOS SOS
正确答案是A