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?（）

单项选择题 In the case of an injury causing a person to be incapacitated，the Master or person in charge of a mobile offshore drilling unit must submit a report to the（）.