A.exchange
B.to exchange
C.exchanging
D.exchanged
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A.adherence to
B.adoption to
C.relaying on
D.usage of
A.keep silence
B.forbid transmission
C.change information
D.impose
A.taken
B.take
C.took
D.taked
A.someone else will take his place
B.the captain will take charge of his work
C.nobody will be capable of doing his work
D.anyone else will use the radio equipment
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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Radio communication（）for many years and helps to save tens of thousands of lives.
The priority of EGC messages is classified by（）.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
Radio beacon can be activated（）in case of distress.
All coast radio stations（）DSC installed for VHF and HF.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
The advantage of geostationary satellites is（）.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.