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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().

发布日期:2021-03-22

When using a high-velocity fog stream in a passage...
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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