单项选择题

Mariners can use DSC for（）.

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

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单项选择题

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

单项选择题

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

单项选择题

A.1,2
B.2,3
C.2,1
D.3,2