A.receive shore-to-ship distress alerting
B.transmit ship-to-shore distress alerting
C.receive message for public correspondence
D.transmit and receive locating signals
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A.can be overcome by using traditional techniques
B.can not be overcome by satellite system
C.can be overcome by satellite and digital techniques
D.can not be tackled by any modern system
A.assist
B.send a rescue
C.search the distress area
D.Reach the distress position at once
A.INMARSAT, EPIRB and DSC
B.NAVTEX, NBDP and R/T
C.INMARSAT, VHF and SART
D.EPIRB, DSC and radar
A.distress and safety radio communication purposes
B.life-saving purpose
C.GMDSS requirements
D.emergency position
A.Q-code
B.Telephone numbers and addresses
C.the international Codes of Signals
D.radio instructions
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By using（）system a ship can send a distress message and know with certainty it will be received.
Ship-to-ship distress alerting should be conducted by（）.
Please use（）for（）.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Before GMDSS, if the radio officer on board is serious ill,（）.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
Radio communication（）for many years and helps to save tens of thousands of lives.
The priority of EGC messages is classified by（）.
The rescue coordination center may（）on stations which interfere with traffic.
The advantage of geostationary satellites is（）.