单项选择题 In accordance with SOLAS，the batteries that power interior lighting in inflatable liferafts can be made to last longer by（）.

单项选择题 In（）convention，a vessel which carries more than 12 passengers shall be deemed as a passenger ship.

单项选择题 How many operators are needed／required on board according to the provisions of the International Convention for the Safety of Life at Sea，1974?（）.