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? （）
A.6 months B.1 year C.2 years D.3 years
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?（）
单项选择题 Each EPIRB required on a ship shall be tested using the integrated test circuit and output indicator every（）.
