单项选择题
A.all vessels B.selected groups of ships C.a particular ship D.A, B, C are all right
DSC distress relays can be transmitted by either（）or（）....
单项选择题DSC distress relays can be transmitted by either（）or（）.
A.a coast station/a ship station B.an EPIRB/a SART C.ARQ/FEC D.a back-up satellite/a land SAR unit
On-scene communications will normally take place betwee...
单项选择题On-scene communications will normally take place between（）.
A.ship in distress and assisting units B.NCS and RCC C.RCCs and „0n-scene commander‟ or “co-ordinator surface search” D.ship in distress and coast station
（）are used for distress alerting as a rule.A.SES/DSC/EP...
单项选择题（）are used for distress alerting as a rule.
A.SES/DSC/EPIRB B.SART/radiotelephone C.COSPAS-SARSAT D.both B and C
