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

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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

单项选择题

There are（）NCSs in total, one in each ocean region, the AOR (E and W), IOR and POR.

A.3
B.2
C.1
D.4