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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相关考题
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单项选择题
Diesel fuel vapors （）.
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
