单项选择题
A.stop the ventilation B.sound the general alarm C.determine the source of the fire D.attempt to extinguish the fire
A combination or all-purpose nozzle produces（）.A.low-ve...
单项选择题A combination or all-purpose nozzle produces（）.
A.low-velocity fog only B.a solid stream only C.a solid stream and foam D.a solid stream and fog
A CO2 portable extinguisher is annually checked by（）.A....
单项选择题A CO2 portable extinguisher is annually checked by（）.
A.reading the gage pressure B.weighing the extinguisher C.discharging a small amount of CO2 D.seeing if the seal has been broken
A CO2 extinguisher on a ship which has lost 10% of its ...
单项选择题A CO2 extinguisher on a ship which has lost 10% of its charge must be（）.
A.used at the earliest opportunity B.hydrotested C.recharged D.weighed again in one month
