单项选择题
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
A.adherence to
B.adoption to
C.relaying on
D.usage of
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The rescue coordination center may（）on stations which interfere with traffic.
A.keep silence
B.forbid transmission
C.change information
D.impose -
单项选择题
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
A.taken
B.take
C.took
D.taked -
单项选择题
Before GMDSS, if the radio officer on board is serious ill,（）.
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
