A.English/all distress communications
B.Chinese/some distress calls
C.the language decided by Administration/all distress calls
D.Japanese/some distress alerts
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A.countries
B.states
C.names
D.groups
A.200
B.300
C.400
D.800
A.a dummy antenna
B.a supporting facilities
C.a back-up equipment
D.an antenna
A.HF
B.VHF
C.MF
D.MF/HF
A.518
B.2182
C.156.8
D.2187.5
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COSPAS-SARSAT is intended to be used for（）.
Please use（）for（）.
All coast radio stations（）DSC installed for VHF and HF.
The priority of EGC messages is classified by（）.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
The vessel has stayed in port for seven days because she needs（）.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
The rescue coordination center may（）on stations which interfere with traffic.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.