Fire may be spread by which means?（）.

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

A.salt water and a wire brush
B.caustic soap
C.mild soap and fresh water
D.a holystone

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