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（）.

单项选择题 If you are the Master of a towing vessel whose only working radar no longer functions，what must you do?（）

单项选择题 If a fixed foam firefighting system on a ship is not of the premix type，a sample of the foam liquid must be tested by（）.