A.Any one component can be eliminated to extinguish a fire
B.Any two components must be eliminated to properly extinguish a fire
C.Any three components must be eliminated to properly extinguish a fire
D.Ali four components must be eliminated to extinguish any fire
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A.the heat
B.the fuel
C.the oxygen
D.any of the above
A.secure the ventilation
B.find a soda acid extinguisher
C.shut off the fuel oil supply
D.secure the generator
A.abandon ship
B.dismissal from drills
C.fire and emergency
D.man overboard
A.are required to go to your life-raft
B.are dismissed from drills
C.should point to the man overboard
D.should start the fire pump
A.conduction
B.convection
C.radiation
D.windage
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When does auxiliary burner of incinerator put into operation? （）Ⅰ. start incinerator when it is coldⅡ. the sludge for dealing with is littleⅢ. the sludge for dealing with is largeⅣ. the water and impurity in sludge are too muchⅤ. the temperature in incinerator is lowⅥ. dealing with little solid rubbish
（）are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
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