A.orbiting satellites in space
B.commercial radio stations
C.private，commercial，and military aircraft
D.ordinary radio stations
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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
A.submarine EPIRB
B.safety EPIRB
C.ship EPIRB
D.survival craft EPIRB
A.is primarily designed for vessels operating up to 50 miles offshore or on foreign waters
B.transmits a signal that can be detected by satellite
C.must be manually activated
D.operates in the medium and low frequency bands
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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.
The rescue coordination center may（）on stations which interfere with traffic.
The advantage of geostationary satellites is（）.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
What following is not among the function of SOLAS ships?（）
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.
COSPAS-SARSAT is intended to be used for（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
Radio beacon can be activated（）in case of distress.