A.fixed
B.matched
C.fitted
D.equal
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A.square
B.triangle
C.circle
D.rectangle
A.cannot
B.are not allowed
C.have the right
D.should get permission to
A.every two years
B.every three years
C.every year
D.every four years
A.the radio regulations
B.the technical terms and definitions
C.how to operate the GMDSS SES equipment
D.Maritime Communications
A.alphabetical
B.figure
C.name of stations
D.series
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The advantage of geostationary satellites is（）.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
Before GMDSS, if the radio officer on board is serious ill,（）.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
All coast radio stations（）DSC installed for VHF and HF.
Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
The rescue coordination center may（）on stations which interfere with traffic.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.