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

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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

单项选择题

An oxygen indicator will detect （）.

A.the amount of oxygen in a space
B.the presence of harmful amounts of carbon monoxide
C.concentrations of explosive gas
D.All of the above