A.coming into effect
B.moving to full effect
C.being based on force
D.coming into force
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A.fixed
B.matched
C.fitted
D.equal
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
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（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.
Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.
Please use（）for（）.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
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.
The vessel has stayed in port for seven days because she needs（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
Ship-to-ship distress alerting should be conducted by（）.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.