单项选择题
On which vessels is GMDSS required? （）
A.All vessels capable of international voyages B.Vessels operating outside of the range of VHF coastal radio stations C.SOLAS Convention ships of 300 gross tonnage or more D.Coastal vessels of less than 300 gross tons
单项选择题 If your vessel is equipped with a radiotelephone，what must also be aboard?（）
单项选择题 If a GMDSS radio operator initiates a DSC distress transmission but does not insert a message，what happens? （）
单项选择题 I have no choice（）to put such remarks.
