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
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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
A.One approved Class A EPIRB
B.Two approved Class A EPIRBs
C.One approved Class B EPIRBs
D.Two approved Class B EPIRBs
A.does not have berthing facilities
B.has berthing and galley facilities
C.is a workboat and her mother ship carries an EPIRB
D.None of the above are correct
A.the information can be received on an ordinary FM radio
B.warnings are printed out for reading when convenient
C.broadcasts are at scheduled times
D.a low frequency band is used for long distance transmission
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（）will form the basis for distress alerting and safety calling.
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.
Before GMDSS, if the radio officer on board is serious ill,（）.
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.
All coast radio stations（）DSC installed for VHF and HF.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.
We consider（）send a helicopter with medical facilities to the distress area.