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單項(xiàng)選擇題

Weight is considered during the periodic required inspection and servicing of（）.

A.CO₂ (carbon dioxide) fire extinguishers
B.foam fire extinguishers
C.water (stored pressure) fire extinguishers
D.All of the above

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單項(xiàng)選擇題

Water fog from an all-purpose nozzle may be used to（）.

A.fight an electrical fire
B.fight a magnesium fire
C.eliminate smoke from a compartment
D.All of the above

單項(xiàng)選擇題

Ventilation systems connected to a compartment in which a fire is burning are normally closed to prevent the rapid spread of the fire by（）.

A.convection
B.conduction
C.radiation
D.spontaneous combustion

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