A.smothering the burning material B.chemical combination with burning material C.absorbing the burning material D.organic destruction of the burning material
A.contaminating food with extinguishing agent B.spreading through the engineering space C.causing loss of stability D.a grease fire in the ventilation system
A.able to absorb heat B.water based C.nonconducting D.nontoxic
A.CO2 B.fresh air C.the tested compartment's air D.water
A.should be worn while fighting a fire B.can be used in atmospheres deficient in oxygen C.filter contaminants from air that is to be breathed D.may be substituted for a self-contained breathing apparatus
A.the paint locker B.spaces open to the atmosphere C.cargo holds D.the engine room
A.8the heat of a fire melting the link B.a break-glass and pull-cable system C.electrical controls on the bridge D.a mechanical arm outside the vent duct
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
A.it provides cooling as a secondary effect B.works well on extinguishing electrical fires C.can be used to combat combustible metal fires D.All of the above
A.the discharge valve is open B.the control box glass is broken C.pressure from the control cylinders is detected D.the control cylinders have been completely discharged
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