单项选择题
A.allowing better access in an emergency B.eliminating potential fuel sources C.eliminating trip hazards D.improving personnel qualifications
Generally，the first action in extinguishing an LFG fire...
单项选择题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
Gas masks（）.A.should be worn while fighting a fireB.can...
单项选择题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
Fusible-link fire dampers are operated by（）.A.8the heat...
单项选择题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
