單項選擇題Fire hose couplings().

A.are made of bronze, brass, or soft alloy metals
B.should be painted rad in order to identify hose lengths
C.are specially hardended to prevent crushing
D.should be greased frequently


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1.單項選擇題Fire may ba spread by which means?().

A.Conduction of heat to adjacent surfaces
B.Direct radiation
C.Convection
D.All of the above

3.單項選擇題Fixed C02 systems would not be used on crew’s quarters or().

A.the paint locker
B.spaces open to the atmospere
C.cargo holds
D.the engine room

4.單項選擇題Foam extinguishes a fire by().

A.shutting off the air supply
B.cooling the fule to below ignition temperature
C.dispersing the fuel
D.removing the source of ignition

5.單項選擇題Foam-type portable fire extinguishers are more usefull in combating fires involving().

A.solid materials such as wood or bales of fiber
B.inflammable liquids
C.electrical equipment
D.metallic solids