单项选择题

When approaching a fire from win ward, you should shield firefighters from the fire by using（）

A.low-velocity fog
B.high-velocity fog
C.a straight stream of water
D.foam spray

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单项选择题

A.can not be ignited by a spark unless the vapor is in a confined space
B.are nontoxic in all concentrations
C.can not be ignited by a spark unless they are at their auto-ignition temperature
D.are heavier than air

单项选择题

All of the following are part of the fire triangle EXCEPT （）.

A.fuel
B.oxygen
C.heat
D.electricity

单项选择题

The vapors given off by heated fuel oil are heavier than air and are（）.

A.odorless
B.explosive
C.nontoxic
D.visible