单项选择题
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
Fire hose couplings（）.A.are made of bronze，brass，or sof...
单项选择题Fire hose couplings（）.
A.are made of bronze，brass，or soft alloy metals B.should be painted red in order to identify hose lengths C.are specially hardened to prevent crushing D.should be greased frequently
