A foam-type portable fire extinguisher would be most useful in combating a fire in（）.

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

A . carried by hand to a fire B . carried or rolled to a fire C . recharged in the field D . used on class "B" fire

A . mattress fires B . oil fires C . wood fires D . All of the above

A . solid materials such as wood or bales of fiber B . flammable liquids C . electrical equipment D . metallic solid

A . invert the CO extinguisher B . squeeze the two trigger handles together C . remove the locking pin D . open the discharge valve

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 . generators B . oil drums C . the bridge controls D . combustible metal

A . solid materials such as wood or bales of fiber B . inflammable liquids C . electrical equipment D . metallic solid

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 . Test the pressure gauge for correct reading B . Weigh the cartridge C . Replace the dry chemical D . Pressure test the discharge hose

A . six weeks B . six months C . twelve months D . two year

A . Dry chemical (cartridge-operated) B . Water (cartridge-operated) C . Water (pump tank) D . Carbon dioxide

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 . turning it upside down B . pressing the foam lever C . squeezing the grip handle D . opening the hose valve

A . soild materials such as wood or bales of fiber B . flammable liquids C . a piece of electrical equipment D . combustible metallic solid

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

A . generators B . oil drums C . the bridge controls D . combustible metal

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

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

A.replaced in its proper location if weight loss is no more than 15% B.replaced in its proper location if weight loss is no more than 25% C.labeled empty and recharged as soon as possible D.labeled empty and replaced in its proper location regardless of weight