單項選擇題Fusible-link fire dampers are operated by（）.

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


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1.單項選擇題Foam-type portable fire extinguishers are most useful in combating fires involving（）.

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

2.單項選擇題Foam is a very effective smothering agent and（）.

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

3.單項選擇題Foam extinguishes a fire mainly by（）.

A.cooling
B.chemical action
C.smothering
D.inerting the air

4.單項選擇題Foam extinguishes a fire by（）.

A.smothering the burning material
B.chemical combination with burning material
C.absorbing the burning material
D.organic destruction of the burning material

5.單項選擇題Foam extinguishes a fire by（）.

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