GMDSS is to provide（）with reliable communication .<br>A:all large passenger vessels<br>B:freighters of more than 300gt in coastal waters<br>C:all passenger ships and cargo ships engaged in international-voyages<br>D:all passenger ships and cargo ships of 300gt upwards in open sea

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

出自：海船船员证

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