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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We consider（）send a helicopter with medical facilities to the distress area.
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.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
SOLAS ships shall be equipped with（）.
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.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Before GMDSS, if the radio officer on board is serious ill,（）.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.