单项选择题
A.penetrates to the bottom of the fire B.is kept saturated with low-velocity water fog C.mixes with the burning fuel oil D.completely covers the top of the burning liquid
Fire may be spread by which means?（）.A.Conduction of he...
单项选择题Fire may be spread by which means?（）.
A.Conduction of heat to adjacent surfaces B.Direct radiation C.Convection D.All of the above
Fire in an engine compartment is best extinguished with...
单项选择题Fire in an engine compartment is best extinguished with carbon dioxide gas (CO2) and by（）.
A.closing the compartment except for the ventilators B.completely closing the compartment C.leaving the compartment open to the air D.increasing the air flow to the compartment by blowers
Fire hose should be washed with（）.A.salt water and a wi...
单项选择题Fire hose should be washed with（）.
A.salt water and a wire brush B.caustic soap C.mild soap and fresh water D.a holystone
