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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SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
We consider（）send a helicopter with medical facilities to the distress area.
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.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
Please use（）for（）.
SOLAS ships shall be equipped with（）.
COSPAS-SARSAT is intended to be used for（）.
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.
Radio communication（）for many years and helps to save tens of thousands of lives.