A.only SAR authorities on land
B.all ships in a very large sea area
C.the nearest coast stations and port radios
D.the SAR authorities ashore as well as ships in the vicinity of the casualty
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A.countries
B.states
C.names
D.groups
A.one
B.two
C.three
D.four
A.a dummy antenna
B.a supporting facilities
C.a back-up equipment
D.an antenna
A.one-way
B.two-way
C.double-effect
D.one-effect
A.distress
B.urgent
C.safety
D.general
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Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
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.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
Radio communication（）for many years and helps to save tens of thousands of lives.
Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
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.
By using（）system a ship can send a distress message and know with certainty it will be received.