单项选择题

The four basic components of a fire are chain reaction, heat, fuel, and （）.

A.carbon monoxide
B.oxygen
C.carbon dioxide
D.any gaseous substance

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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 （）.

A.evacuate all engine room personnel
B.fight the fire with hand portable extinguishers
C.activate the main CO₂ bank
D.stop the flow of leaking fuel oil

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?（）

A.Any one component can be eliminated to extinguish a fire
B.Any two components must be eliminated to properly extinguish a fire
C.Any three components must be eliminated to properly extinguish a fire
D.Ali four components must be eliminated to extinguish any fire

单项选择题

A fire can be extinguished by removing （）.

A.the heat
B.the fuel
C.the oxygen
D.any of the above