Foam
Carbon dioxide
Dry chemical
Water fog
第1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2题：
As an extinguishing agent, foam ______.
A.conducts electricity
B.should be directed at the base of the fire
C.is most efffective on buring gases which are flowing
D.extinguishes by cooling oil fires below ignition temperature
第3题：
The fire extinguishing action of CO 2 comes mostly from ______.
A.breaking the fire chemical chain reaction
B.smothering
C.cooling
D.isolating the heat from the fuel
第4题：
preventing oxygen from reaching the burning material
cooling the burning material below its ignition temperature
using the extinguishing agent to make the burning material fire-resistant
using the extinguishing agent to absorb the heat
第5题：
Alcohol foam
Dry chemical
Chemical foam
Water fog
第6题：
An extinguishing agent which effectively cools, dilutes combustible vapors, removes oxygen, and provides a heat and smoke screen is ______.
A.carbon dioxide
B.Halon 1301
C.dry chemical
D.water fog
第7题：
化学杂交剂（Chemical Hybridizing Agent，CHA）
第8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9题：
acrylic acid
benzene
oleum
vinyl toluene
第10题：
Class A and class B
Class B and class C
Class A and class C
Class C, class D, and class E