alternate expansion and contraction as water in a liquid state becomes a vapor
absorption of smoke and gases as water is converted from a liquid to a vapor
rapid contraction as water is converted from a liquid to a vapor
rapid expansion as water absorbs heat and changes to steam
第1题：
After extinguishing a fire with CO2, it is advisable to ______.
A.use all CO2 available to cool the surrounding area
B.stand by with water or other agents
C.thoroughly ventilate the space of CO2
D.jettison all burning materials
第2题：
Generally, the first action in extinguishing an LFG fire caused by escaping gas is to ______.
A.sweep flames away with water spray
B.shut off the leak
C.use a chemical foam fire extinguisher
D.call the local fire department
第3题：
Halogenated hydrocarbon， Halon in short form，is used on board ship as ________ ．
A.fire-extinguishing medium
B.a standard fire test
C.a non-combustible material
D.a fire main
第4题：
acrylic acid
benzene
oleum
vinyl toluene
第5题：
Deep-fat cooking equipment shall be fitted with the following:（）
第6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7题：
SWITCH ON FIRE-EXTINGUISHING SYSTEM.的意思是：开启灭火系统。
第8题：
A galley grease fire on the stove may be extinguished using______．
A.water
B.foam
C.the range hood extinguishing system
D.fire dampers
第9题：
Electrically non-conductive
Relatively inexpensive
Effective against chemicals containing an oxidizer
All of the above
第10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