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 extinguishers used on ship’s are numbered by size I through V，with I being（）.
单项选择题 Fire dampers prevent the spread of fire by（）.
