A.4
B.9
C.8
D.5
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A.the weather is always terrible
B.the condition there is complicated
C.the signals are too strong
D.their SES may recive the signals from unwanted satellite
A.international NAVTEX Service
B.FleetNET Service
C.SafetyNet Service
D.WWNWS
A.can suppress
B.can be suppressed
C.can not be suppressed
D.are to be suppressed
A.frequency allocated
B.both language and frequency
C.language used
D.transmission power and time
A.10 minutes every 4 hours
B.half an hour every other hour
C.irregular period of time
D.5 minutes every two hours
最新試題
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
On-scene communications will normally take place between（）.
Please use（）for（）.
（）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.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
Before GMDSS, if the radio officer on board is serious ill,（）.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
We consider（）send a helicopter with medical facilities to the distress area.