单项选择题 The FIRST step to take in fighting an engine room fire resulting from a ruptured fuel oil service line, is to （）.

单项选择题 The four basic components of a fire are fuel, heat, oxygen and a chain reactionWhich of the following statements best describes what must be eliminated to extinguish a fire?（）

单项选择题 A fire can be extinguished by removing （）.