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
Before GMDSS, if the radio officer on board is serious ill,（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
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.
COSPAS-SARSAT is intended to be used for（）.
Please use（）for（）.
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.
Radio beacon can be activated（）in case of distress.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
The advantage of geostationary satellites is（）.