A.which
B.on which
C.at which
D.in which
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A.it necessary
B.it is necessary
C.it necessary to
D.necessary
A.depend on
B.depending on
C.dependent on
D.depended on
A.exchange
B.to exchange
C.exchanging
D.exchanged
A.adherence to
B.adoption to
C.relaying on
D.usage of
A.keep silence
B.forbid transmission
C.change information
D.impose
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We consider（）send a helicopter with medical facilities to the distress area.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
All coast radio stations（）DSC installed for VHF and HF.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
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（）.
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.