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（）.
单项选择题 Fire hose should be washed with（）.
单项选择题 Fire hose couplings（）.
