单项选择题
Which one is true as regards to the hard hat according to the passage?（）
A.It needs not to be regularly replaced B.It is designed to protect from possible impact C.It is required to be worn on deck at all times by all ships D.fibreglass hardhat should not be used on board ships
单项选择题 Which one is not important for your safety on board ship?（）
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?（）
