单项选择题
Which one is not important for your safety on board ship?（）
A.know where the lifejacket is stowed B.know where the life-saving craft are fitted on the ship C.know the escape routes D.Good professional knowledge
单项选择题 Which one might be used most likely in case of a fire?（）
单项选择题 Which one is not the personal safety equipment?（）
单项选择题 Water is a very effective fire extinguishing agent because it（）
