penetrates to the bottom of the fire
is kept saturated with low-velocity water fog
mixes with the burning fuel oil
completely covers the top of the burning liquid
第1题：
The most effective way to apply a foam stream if the fire is on deck or is a runing fire, is to direct the stream ______.
A.onto the surface of the burning liquid
B.ahead of the burning liquid and bounce it on the fire
C.at the base of the burning liquid in a sweeping motion
D.just above the surface of the burning liquid
第2题：
When compared to a high-expansion foam，a low-expansion foam will ______．
A.Be dryer
B.Be lighter
C.Be less heat resistant
D.Not cling to vertical surfaces
第3题：
One of the limitations of foam as an extinguishing agent is that foam ______.
A.cannot be made with salt water
B.is heavier than oil and sinks below its surface
C.is corrosive and a hazard to fire fighters
D.conducts electricity
第4题：
The foam extinguisher should be used （）.
第5题：
Foam is a very effective smothering agent and ______.
A.it provides cooling as a secondary effect
B.works well on extinguishing electrical fires
C.can be used to combat combustible metal fires
D.All of the above
第6题：
If a fixed foam firefighting system on a ship is not of the premix type，a sample of the foam liquid must be tested by ______.
A.a Coast Guard inspection officer
B.the safety man aboard the unit
C.the designated person in charge of the unit
D.the manufacturer or his authorized representative
第7题：
Firefighting foam is only effective when the foam _____.
A.penetrates to the bottom of the fire
B.is kept saturated with low-velocity water fog
C.mixes with the burning fuel oil
D.completely covers the top of the burning liquid
第8题：
The BEST method of applying foam to a fire is to ______.
A.spray directly on the base of the fire
B.flow the foam down a nearby vertical surface
C.sweep the fire with the foam
D.spray directly on the surface of the fire
第9题：
泡沫细胞（foam cell）
第10题：
（）表示“浴液”的意思。