单项选择题

DSC distress acknowledgements are normally transmitted by（）in respond to a receiver DSC distress call.

A.Ship stations
B.Coast stations
C.NCSs
D.NCC

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单项选择题

Distress and safety communications following DSC calling will be performed by radiotelephony or（）.

A.NBDP
B.EGC receiver
C.NBDP or both
D.EGC receiver or both

单项选择题

If a ship station relays a DSC distress call to an appropriate coast station, it means that（）.

A.the ship has received the DSC distress call on a HF frequency
B.the coast station concerned has not acknowledged it within 5 minutes
C.the ship will take command of search and rescue in 5 minutes
D.A and B

单项选择题

After has permit the commissioning, the（）will permit the SES access to system.

A.INMARSAT
B.IMO
C.MSC
D.CES