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 CO₂with 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

相关考题

In fighting a fire in a fuel tank, the FIRST action you...

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 CO₂release controls

Which of the following conditions is true concerning a ...

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

The volatility of a liquid is the tendency of a liquid ...

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

船舶电气与船舶安全

The FIRST course of action in fighting a fire in a cargo or fuel oil tank is to （）.