单选题When using a high-velocity fog stream in a passageway，the possibility of a blow back must be guarded against. Blow back is most likely to occur when（）.Apressure builds up in the nozzle which causes a surge of waterBthe only opening in a passageway is the one from which the nozzle is being advancedCpressure in the fire hose drops below 100 psiDa bulkhead collapses due to heat and pressure
单选题
When using a high-velocity fog stream in a passageway，the possibility of a blow back must be guarded against. Blow back is most likely to occur when（）.
A
pressure builds up in the nozzle which causes a surge of water
B
the only opening in a passageway is the one from which the nozzle is being advanced
C
pressure in the fire hose drops below 100 psi
D
a bulkhead collapses due to heat and pressure
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