單項選擇題

A.general communication
B.distress alerting and safety calling
C.receive MSI
D.both B and C

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A.Ship owner‟s will
B.economic condition
C.the area in which the ship operates
D.different orders of all countries

A.Distress, Urgency and Safety
B.Vital, Important and Routine
C.NAVAREA, Coastal and local
D.gale, Tsunami and Ice

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