A.MF/HF
B.SART
C.EPIRB
D.any of A, B, C
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A.only automatically
B.only manually
C.both automatically and manually
D.only by remote control
A.be damaged
B.work normally regardless of harmful conditions
C.not wok though it is not in a bad condition
A.COSPAS-SARSAT
B.SATELLITE
C.terrestrial radio
D.INMARSAT
A.RCC
B.MCC
C.LUT
D.MRCC
A.distress alerting
B.locating 406mhz EPIRBs
C.storing distress signal
D.A and B
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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.
By using（）system a ship can send a distress message and know with certainty it will be received.
Before GMDSS, if the radio officer on board is serious ill,（）.
On-scene communications will normally take place between（）.
The advantage of geostationary satellites is（）.
The vessel has stayed in port for seven days because she needs（）.
We consider（）send a helicopter with medical facilities to the distress area.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.