The spread of fire is NOT prevented by（）. A: shutting off the oxygen supply B: cooling surfaces adjacent to the fire C: removing combustibles from the endangered area D: removing smoke and toxic gases by ensuring adequate ventilatio

If heavy smoke is coming from the paint locker,the first firefighting response should be to（）. A: release the CO fiooding system B: open the door to evaluate of the fire C: enter and use a portable extinguisher D: secure the ventilatio