单项选择题
The FIRST course of action in fighting a fire in a cargo or fuel oil tank is to （）.
A.secure all openings to the tank
B.discharge an initial charge of CO2 with a hand portable extinguisher
C.direct a fire hose into the tank and energize the fire main
D.spray the tank boundaries with a fire hose to promote cooling
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相关考题
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单项选择题
In fighting a fire in a fuel tank, the FIRST action you should attempt is to （）.
A.secure all sources of fresh air to the tank
B.begin transferring the fuel to other tanks
C.top off the tank to force out all vapors
D.station someone at the fixed CO2 release controls -
单项选择题
Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?（）
A.The mixture is too lean to burn
B.The mixture is too rich to burn
C.The vapor is about to explode
D.Conditions are perfect for combustion -
单项选择题
The volatility of a liquid is the tendency of a liquid to （）.
A.ignite
B.explode
C.asphyxiate
D.vaporize
