单选题GMDSS is to provide（）with reliable communication .Aall large passenger vesselsBfreighters of more than 300gt in coastal watersCall passenger ships and cargo ships engaged in international-voyagesDall passenger ships and cargo ships of 300gt upwards in open sea
单选题
GMDSS is to provide（）with reliable communication .
A
all large passenger vessels
B
freighters of more than 300gt in coastal waters
C
all passenger ships and cargo ships engaged in international-voyages
D
all passenger ships and cargo ships of 300gt upwards in open sea
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