單項(xiàng)選擇題

Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.

A.sweep flames away with water spray
B.shut off the leak
C.use a chemical foam fire extinguisher
D.call the local fire department

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單項(xiàng)選擇題

Gas masks（）.

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

單項(xiàng)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

Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.

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Gas masks（）.

Fusible-link fire dampers are operated by（）.

Generally，the first action in extinguishing an LFG fire caused by escaping gas is to（）.