Deck : Safety - 842/2841
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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 __________. |
| A) a bulkhead collapses due to heat and pressure |
| B) the only opening in a passageway is the one from which the nozzle is being advanced |
| C) pressure builds up in the nozzle which causes a surge of water |
| D) pressure in the fire hose drops below 100 psi |
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