Which of the fire extinguishing agents...

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

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1.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

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2.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

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3.单项选择题If a CO₂ fire extinguisher is not readily available, which of the listed fire extinguishers would be best suited to combat a small electrical fire in a switchboard?（）

A.Dry chemical
B.Halon
C.Low velocity fog
D.Steam

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4.单项选择题You hear the general alarm bells and ships whistle sound for over 10 secondsTraditionally, this is the signal for （）.

A.abandon ship
B.dismissal from drills
C.fire and emergency
D.lower lifeboats

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5.单项选择题The abandon ship signal sounded by the vessels whistle is （）.

A.6 short blasts and 1 long blast
B.long blast mare than 6 short blasts
C.more than 6 short blasts and 1 long blast
D.1 long blast of at least 10 seconds

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6.单项选择题If you have to abandon ship and enter a life-raft, your main course of action should be （）.

A.remain in the vicinity of the vessel
B.head for the closest land
C.head for the closest sea-lanes
D.get a majority opinion

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7.单项选择题In the first 24 hours after abandoning a vessel, water should be given only to personnel who are（）.

A.thirsty
B.sick or injured
C.wet
D.awake

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8.单项选择题Diesel fuel is relatively safe to handle due to its low volatility, but the fumes will self-ignite and continue to burn steadily if the fuel is heated to the （）.

A.flash point
B.auto-ignition point
C.volatility point
D.upper explosive limit

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9.单项选择题If the buoyant force on a ships hull is equal to or greater than the displacement tonnage, the ship will （）.

A.require ballast added to only the port side tanks
B.be down by the head
C.sink
D.float

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10.单项选择题When fighting an electrical fire, you should first （）.

A.stop ventilation to the area
B.stop the vessel
C.secure electricity to the circuit
D.apply CO₂to the fire

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