A.selective and can be suppressed by ships
B.mandatory and can not be suppressed by ships in the affected area
C.not very important so that ships don‟t require them
D.received by all ships wherever they are
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A.all vessels
B.selected groups of ships
C.a particular ship
D.A, B, C are all right
A.a coast station/a ship station
B.an EPIRB/a SART
C.ARQ/FEC
D.a back-up satellite/a land SAR unit
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
A.SES/DSC/EPIRB
B.SART/radiotelephone
C.COSPAS-SARSAT
D.both B and C
A.general communication
B.distress alerting and safety calling
C.receive MSI
D.both B and C
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（）will form the basis for distress alerting and safety calling.
The rescue coordination center may（）on stations which interfere with traffic.
All coast radio stations（）DSC installed for VHF and HF.
Ship-to-ship distress alerting should be conducted by（）.
Before GMDSS, if the radio officer on board is serious ill,（）.
The advantage of geostationary satellites is（）.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
COSPAS-SARSAT is intended to be used for（）.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.