A.subject for
B.liable to
C.easy to meet
D.always encounter
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A.NBDP/VHF radio
B.Inmarsat safetyNet/NAVTEX
C.Safety service / Inmarsat-A
D.Long range / short range
A.FEC and ARQ
B.satellite and terrestrial communications
C.radio and telex
D.NBDP
A.by day or at night
B.almost round the clock
C.somewhat and sometime
D.from sunrise to sunset
A.transmit distress signal
B.send response signal
C.transmit the signal of ship‟s position
D.be interrogated by X-band radar
A.sight or sound
B.seeing or sounding
C.visual or audible
D.seeing or hearing
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（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.
At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
The priority of EGC messages is classified by（）.
On-scene communications will normally take place between（）.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
We consider（）send a helicopter with medical facilities to the distress area.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
By using（）system a ship can send a distress message and know with certainty it will be received.