单项选择题
A.Master of the vessel
B.USCG Officer in Charge of Marine Inspection
C.Owner or operator of the vessel
D.Company's personnel director
单项选择题 Official proof of an American vessel’s nationality is contained in the（）.
单项选择题 Inspection of a Halon extinguisher involves checking the hose，handle，nozzle，and（）.
单项选择题 In the event of a casualty to a ship，who is responsible to make records available to the Coast Guard official authorized to investigate the casualty?（）