单项选择题 During tours of inspection in the machinery space, you found a fire on a running generator, what should you do first?（）

单项选择题 What is used for preventing pollution damage to the sea from ships?（）

单项选择题 However, where immediate action is necessary to ensure safety of the ship, its machinery and crew, it must be taken by the engineer in chargeWhat dose “it” mean in the sentence above?（）