单项选择题
The rescue coordination center may（）on stations which interfere with traffic.
A.keep silence B.forbid transmission C.change information D.impose
单项选择题 Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
单项选择题 Before GMDSS, if the radio officer on board is serious ill,（）.
单项选择题 What following is not among the function of SOLAS ships?（）
