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（）.
单项选择题 You are signing on a deck officer，who will be designated as one of the GMDSS operators，before sailing foreign．Which statement is TRUE（）.
单项选择题 Which statement is TRUE（）.
