单项选择题
How long must the GMDSS radio log be retained on board?（）
A.At least two years after the last entry B.At least one year after the last entry C.At least 90 days after the last entry D.At least 30 days after the last entry
单项选择题 How long must GMDSS Radio Logs be retained by the licensee when they relate to a distress situation or disaster? （）
单项选择题 For GMDSS，which statement concerning a compulsory vessel is FALSE?（）
单项选择题 For GMDSS，when may a compulsory vessel not be allowed to leave port?（）
