A.general radio communication
B.MSI
C.improved distress and safety communication
D.bridge-to-bridge communication
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A.ITU
B.IMO
C.MSC
D.WMO
A.promote
B.improve
C.guarantee
D.both A and B
A.taking the place of the radio system
B.introducing a new life-saving system
C.saving the vessels in distress
D.improving the communication on land
A.was suffering
B.is suffering
C.has suffered
D.has been suffering
A.see
B.seeing
C.be seen
D.being seen
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Radio beacon can be activated（）in case of distress.
（）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.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
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.
The vessel has stayed in port for seven days because she needs（）.
By using（）system a ship can send a distress message and know with certainty it will be received.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Radio communication（）for many years and helps to save tens of thousands of lives.
SOLAS ships shall be equipped with（）.