单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

Under the regulations for cargo vessels，which statement is TRUE concerning fireman’s outfits?（）

A.If a vessel carries two outfits，they may be stored in the same location
B.Each fireman's outfit shall contain a flame safety lamp of an approved type
C.Each fireman's outfit shall contain a fresh-air breathing apparatus
D.All of the above