单项选择题

The quality of the message can be affected by（）.

A.climate
B.sunshine
C.human beings
D.both a and b

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单项选择题

The complying vessels can transmit ship-to-shore distress alerts by at least（）.

A.One means, whether satellite or terrestrial techniques
B.Two means, whether satellite or terrestrial techniques
C.Two separate and independent means, each using different radio communication services
D.Two means, such as MF DSC and HF DSC

单项选择题

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

单项选择题

IMO has decided that all ships over 300TGt must be fitted with a NAVTEX receiver（）.

A.by 01 Feb 1992
B.by 01 Aug 1993
C.between 01 Feb 1992 and 01 Feb 1999
D.before 01 Feb 1992