A.871
B.872
C.873
D.874
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A.routine
B.distress
C.urgency
D.safety
A.581
B.582
C.583
D.584
A.routine
B.distress
C.urgency
D.safety
A.Network
B.The CES preferred by the applicant
C.INMARSAT
D.The SES itself
A.INMARSAT
B.IMO
C.MSC
D.CES
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Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Radio communication（）for many years and helps to save tens of thousands of lives.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
The priority of EGC messages is classified by（）.
By using（）system a ship can send a distress message and know with certainty it will be received.
Before GMDSS, if the radio officer on board is serious ill,（）.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.
On-scene communications will normally take place between（）.
What following is not among the function of SOLAS ships?（）