单项选择题

Which of the listed fire extinguishers is recommended for use on an electrical switchboard fire?（）

A.CO₂
B.ABC dry chemical
C.CO₂propelled foam
D.All of the above

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单项选择题

Which of the fire extinguishing agents listed is the safest to use when combating a class C fire?（）

A.CO₂
B.Foam
C.Water fog
D.Soda acid

单项选择题

Which of the following represents the emergency signal for fire aboard ship?（）

A.More than six short blasts and one long blast on the whistle
B.Continuous blast of the ships whistle for a period of not less than 10 seconds supplemented by the same signal on the general alarm
C.Three short blasts of the whistle supplemented by the same signal on the general alarm
D.More than six short blasts and one long blast on the whistle supplemented by the same signal on the general alarm

单项选择题

To extinguish an electrical fire, you should use （）.

A.mechanical foam
B.chemical foam
C.carbon dioxide
D.soda acid