greater range
effective on all types of fires
cleanliness
All of the above
第1题：
______, 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
第2题：
An advantage of a dry chemical over a carbon dioxide fire extinguisher is its ______.
A.greater range
B.effectiveness on all types of fires
C.cleanliness
D.All of the above
第3题：
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
第4题：
Alcohol foam
Dry chemical
Chemical foam
Water fog
第5题：
As compared to carbon dioxide, dry chemical has which advantage? ______.
A.Cleaner
B.Effective on metal fires
C.Greater range
D.More cooling effect
第6题：
An ABC dry chemical fire extinguisher would be LEAST effective against a fire in ______.
A.a mattress
B.spilled liquids such as oil or paint
C.high voltage electrical gear
D.a trash can
第7题：
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
第8题：
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
第9题：
An engine compartment gasoline fire requires which type of extinguisher?______.
A.Carbon dioxide
B.Dry chemical
C.Foam
D.All of the above
第10题：
Batten down the engine room
start the fire pump
apply carbon dioxide to the fire
shut off the fuel supply