单项选择题
Firefighting foam is only effective when the foam（）.
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
点击查看答案&解析
相关考题
-
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 -
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 -
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
