A.week
B.two weeks
C.month
D.two months
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A.easy access to its storage compartment
B.replacement of the battery without exposure to the weather
C.it to float free if the vessel sinks
D.it to remain attached to the vessel
A.all required documents and publications may have to be produced
B.licensed GMDSS radio operators may be required to demonstrate equipment competencies
C.all required equipment must be fully operational
D.All of the above
A.manually activated and operate on maritime (VHF) channels
B.automatically activated and operate on maritime (VHF) channels
C.manually operated and detected by satellite
D.automatically operated and detected by satellite
A.self-propelled，inspected vessels
B.towing vessels
C.recreational vessels
D.uninspected passenger vessels
A.orbiting satellites in space
B.commercial radio stations
C.private，commercial，and military aircraft
D.ordinary radio stations
最新試題
All coast radio stations（）DSC installed for VHF and HF.
（）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.
Radio communication（）for many years and helps to save tens of thousands of lives.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
The advantage of geostationary satellites is（）.
The priority of EGC messages is classified by（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
On-scene communications will normally take place between（）.
Please use（）for（）.