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單項(xiàng)選擇題

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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單項(xiàng)選擇題

Equipment requirement vary according to（）.

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

單項(xiàng)選擇題

The WWNWS establishes three types of navigational warning:（）.

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

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