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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The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
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.
Radio communication（）for many years and helps to save tens of thousands of lives.
（）will form the basis for distress alerting and safety calling.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
All coast radio stations（）DSC installed for VHF and HF.
Before GMDSS, if the radio officer on board is serious ill,（）.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
The priority of EGC messages is classified by（）.