A.a safety line attached to a man working over the side
B.used to measure water depth
C.used to slow the headway of a barge
D.used to measure the overhead height of a bridge
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Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
Please use（）for（）.
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.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
Before GMDSS, if the radio officer on board is serious ill,（）.
On-scene communications will normally take place between（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
What following is not among the function of SOLAS ships?（）
COSPAS-SARSAT is intended to be used for（）.