单项选择题
A.reach the distress area B.conduct a sector search C.send rescue vessels D.assist coordinately in SAR operation
In the GMDSS, distress alerting can be transmitted in()...
单项选择题In the GMDSS, distress alerting can be transmitted in()directions.
A.1 B.2 C.3 D.4
We()the distress signal on our own radio before the sho...
单项选择题We()the distress signal on our own radio before the shore station relayed it to us.
A.received alreadly B.have received C.had received D.was receiving
The frequency 156.525MHZ and 156.8MHZ should be used in...
单项选择题The frequency 156.525MHZ and 156.8MHZ should be used in the band of().
A.MF B.VHF C.HF D.LF