A CO2 extinguisher on a ship which has lost 10% of its charge must be（）.

A . Point the horn down B . Turn cylinder upside-down C . Break the rupture disc D . Pull pin，squeeze gri

A . Foam B . Carbon dioxide C . Dry chemical D . Water fog

A . opened and burned material removed B . left closed with vents off until all boundaries are cool C . checked for oxygen content D . doused with water to prevent reflash

A . Dry chemical B . Halon C . Low velocity fog D . Steam

A . a blanket of bubbles formed on the surface of the fire B . smothering C . cooling D . isolating the heat from the fuel

A . actuate an alarm and open the engine room control valve B . actuate an alarm and open the engine room CO releasing valve C . open the engine room control valve and shut off engine room ventilation fans D . open the engine room control valve and then the CO releasing valve

A . use all CO available to cool the surrounding area B . stand by with water or other agents C . thoroughly ventilate the space of CO D . jettison all burning material

A . outside B . on class C fires C . in an emergency D . on class B fire

A . the CO being inhaled by personnel B . reflash of burning liquids C . vapor condensation on the extinguisher D . the discharge causing a static spark

A . Check the tag to see when the extinguisher was last charged B . Release a small amount of CO ; if the CO discharges，the extinguisher is acceptable C . Weigh the extinguisher and compare the weight against that stamped on the valve D . Recharge the extinguisher at least once each year

A . maximum pressure allowed at that branch B . name of the space or spaces which it serves C . date of the last maintenance inspection D . pressure needed to maintain an effective stream at that point

A . there are fifteen pounds of CO in the container B . the container，when full，weighs fifteen pounds C . the pressure at the discharge nozzle is l5 psi D . the empty container weighs fifteen pound

A . reading the gage pressure B . weighing the extinguisher C . discharging a small amount of CO D . seeing if the seal has been broke

A . base of the equipment B . top of the equipment C . power source D . source of the fire

A . the name of the unit on which it is located B . the date that it was installed on the unit C . the names of the individuals qualified to use it D . an identification number different from other extinguishers on the unit

A . Operate the trigger valve B . Weigh the extinguisher C . Test with a pressure gauge D . Read the date of last test

A . water B . foam C . the range hood extinguishing system D . fire damper

A . contains 15 pounds of CO B . weighs 15 pounds when full of CO C . has 15 pounds of pressure at the nozzle D . weighs 15 pounds when empty

A . cooling B . smothering C . chemical action D . All of the above

A . put back in service if some CO remains B . hydrostatically tested C . retagged D . recharged

A . Alcohol foam B . Dry chemical C . Chemical foam D . Water fog

A . at the top of the flames B . at the base of the fire near the edge C . in short quick bursts D . toward the upwind side of the fire

A . Carbon dioxide B . Water (stored pressure) C . Foam D . Carbon tetrachloride

A . class A B . class B C . class C D . class D