单项选择题
Each lifeboat must be lowered and maneuvered in the water at least once every（）.
A.2 months B.3 months C.4 months D.5 months
单项选择题 During the required periodic abandon ship drill aboard a ship，each person not assigned duties in the muster list is（）.
单项选择题 During a fire drill on a ship，what action is required?（）
单项选择题 After abandoning ship，you should deploy the sea anchor from a liferaft to（）.
