單項(xiàng)選擇題Gas masks().

A.should be worn while fighting a fire
B.can be used in atmosphere deficient in oxygen
C.filter contaminants from air that is to be breathed
D.may be substituted for a self-contained breathing apparatus


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1.單項(xiàng)選擇題Gasoling fumes tend to().

A.settle near the bottom of the blige
B.settle near the top of the bilge
C.settle evenly throughout all levels of the bilge by mixing with air
D.disperse to atmosphere

2.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 t e local fire department

3.單項(xiàng)選擇題Generally, what is used to inflate life rafts?().

A.Non-toxic gas
B.oxygen
C.Hydrogen
D.Helium

4.單項(xiàng)選擇題Generally, when lifting an inflatable life raft back aboard ship you would use the().

A.towing bridle
B.main weather cover
C.external lifelines
D.righting strap

5.單項(xiàng)選擇題Get the searchlight()for transiting the cancal at night.

A.turned off
B.already
C.almost
D.ready