单选题A carbon dioxide fire extinguisher has been partially discharged, and should be immediately （）.A tagged and restowed properly in its rackB weighed and the charge loss recordedC given to the chief engineer for rechargingD tagged empty and stowed separat

The most effective way of applying carbon dioxide from a portable extinguisher to a fire is by ______．

A.Forming a cloud cover over the flames

B.Directing the gas at the base of the flames in a slow sweeping motion

C.Discharging the carbon dioxide into the heart of the flames

D.Bouncing the discharge off an adjacent bulkhead just above the burning surface

A carbon dioxide fire extinguisher should be recharged ______.

A.at least annually

B.whenever it is below its required weight

C.only if the extinguisher has been used

D.before every safety inspection

Which of the following is (are)an advantage of a dry chemical extinguisher over a carbon dioxide extinguisher？The dry chemical extinguisher：Ⅰ．Has a greater range．Ⅱ．Provides a heat shield for the operator．

A.Ⅰonly

B.Ⅱonly

C.Both Ⅰand Ⅱ

D.Neither Ⅰ nor Ⅱ

An engine compartment gasoline fire requires which type of extinguisher?______.

A.Carbon dioxide

B.Dry chemical

C.Foam

D.All of the above

______, as the chemical extinguisher agent, should be used for an electric fire.

A.dry chemical or foam

B.foam or soda acid

C.carbon dioxide or foam

D.carbon dioxide or dry chemical

An advantage of an ABC dry chemical over a carbon dioxide fire extinguisher is ______.

A.lack of toxicity

B.the multipurpose extinguishing ability

C.burn-back protection

D.cooling ability

A squeeze-grip type carbon dioxide portable fire extinguisher has been partially discharged.It should be ______.

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