网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
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
参考答案
参考解析
解析：
暂无解析
更多 “单选题Foam is a very effective smothering agent and（）.A it provides cooling as a secondary effectB works well on extinguishing electrical firesC can be used to combat combustible metal firesD All of the above” 相关考题
考题
I know personal selling is also a very effective tool for building ______buyers’ confidence.
A.toB.upC.with
考题
One of the limitations of foam as an extinguishing agent is that foam ______.A.cannot be made with salt waterB.is heavier than oil and sinks below its surfaceC.is corrosive and a hazard to fire fightersD.conducts electricity
考题
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 liquidB.ahead of the burning liquid and bounce it on the fireC.at the base of the burning liquid in a sweeping motionD.just above the surface of the burning liquid
考题
______, as the chemical extinguisher agent, should be used for an electric fire.A.dry chemical or foamB.foam or soda acidC.carbon dioxide or foamD.carbon dioxide or dry chemical
考题
As an extinguishing agent, foam ______.A.conducts electricityB.should be directed at the base of the fireC.is most efffective on buring gases which are flowingD.extinguishes by cooling oil fires below ignition temperature
考题
Firefighting foam is only effective when the foam _____.A.penetrates to the bottom of the fireB.is kept saturated with low-velocity water fogC.mixes with the burning fuel oilD.completely covers the top of the burning liquid
考题
Foam is a very effective smothering agent and ______.A.it provides cooling as a secondary effectB.works well on extinguishing electrical firesC.can be used to combat combustible metal firesD.All of the above
考题
She is very ingenious when it comes to finding excuses.A:effective
B:clever
C:implausible
D:original
考题
She's very ingenious when it comes to finding excuses.A:clever
B:effective
C:original
D:implausible
考题
IBM Global Mirror is based on which of the following very effective copy services functions（）A、Metro Mirror andFlashCopyB、Global Copy andFlashCopyC、Metro Mirror and Global CopyD、OEL and Global Copy
考题
单选题Which is the best sentence to insert between sentence 13 and sentence 14?A
Examples such as this demonstrate that incentives can be very effective.B
If the penalty had been greater, perhaps it would have had the desired effect.C
Clearly, rewards are more effective in most situations than punishments.D
Many schools have also implemented effective after-school reading programs.E
I’m not sure what the school decided to do with the program, since it wasn’t working.
考题
单选题Production of mechanical foam by a portable in-line foam proportioner（）.A
increases the size of foam bubbles formedB
increases the rate of foam productionC
improves the extinguishing properties of foamD
gives the nozzleman more freedom of movement，since it can be placed anywhere in the hose line
考题
单选题Which extinguishing agent is effective in combating an isoprene fire?（）A
Dry chemicalsB
CO2C
FoamD
All the above
考题
单选题Portable foam type fire extinguishers are most effective on（）.A
mattress firesB
oil firesC
wood firesD
All of the above
考题
单选题What is an advantage of using foam in fire fighting?（）A
It is MOST effective on very hot oil fires where the temperatures of the liquid exceed 100°C (212°F)B
Most foams can be used with dry chemicals to attack a fire by two methodsC
Foam is effective on combustible metal firesD
Foam can be made with seawater or fresh water
考题
单选题What is an advantage of using foam in fire fighting?（）A
It is effective in controlling fire in flowing oil such as coming from a broken fuel lineB
It absorbs heat from materials that could cause reignitionC
Most foams can be used jointly with dry chemical extinguishing agents to attack a fire by two methods of extinguishmentD
Once the surface is blanketed with foam and the fire is extinguished，no further foam is required
考题
单选题Which statement about firefighting foam is TRUE?（）A
Foam conducts electricityB
To be most effective，foam should be directed at the base of the fireC
Foam is most effective on burning liquids which are flowingD
Foam can ONLY be used to extinguish class A fires
考题
单选题Water is a very effective fire extinguishing agent because it（）A
will remove all the toxic fumes from the airB
has the greatest cooling abilityC
will leave no harmful residueD
completely removes combustible vapors from the air
考题
单选题Which fire extinguishing agent can NOT be used on an ethylenediamine?（）A
Water foamB
Dry chemical powderC
Water fogD
Alcohol foam
考题
单选题As an extinguishing agent，foam（）.A
conducts electricityB
should be directed at the base of the fireC
is most effective on burning gases which are flowingD
extinguishes by cooling oil fires below ignition temperature
考题
单选题When there is a fire in a large electric motor, normally the very FIRST step is to （）A
secure the electric supplyB
ventilate area to remove smokeC
start the fire pump and lead out hoseD
apply foam
考题
单选题Carbon dioxide as a fire fighting agent has which advantage over other agents?（）.A
It causes minimal damageB
It is safe for personnelC
It is cheaperD
It is most effective on a per unit basis
考题
单选题Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）A
The agent is considered nontoxic at room temperature in low concentrationsB
The agent is less effective than carbon dioxideC
Halon primarily extinguishes the fire by coolingD
The agent cannot be used on electrical fires because it leaves a residue
考题
单选题Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?（）A
Carbon dioxide is corrosive when exposed to fireB
Carbon dioxide should be applied slowly to a large engine room fireC
Its total cooling effect is far greater than waterD
Its smothering effect is excellent for class B fires
考题
单选题0ne of the limitations of foam as an extinguishing agent is that foam（）.A
cannot be made with salt waterB
is heavierthan oil and sinks below its surfaceC
is corrosive and to fire fightersD
conducts electricity
考题
单选题Which extinguishing agent is most effective on a mattress fire?（）A
CO2B
FoamC
Dry ChemicalD
Water
考题
单选题Firefighting foam is only effective when the foam（）.A
penetrates to the bottom of the fireB
is kept saturated with low-velocity water fogC
mixes with the burning fuel oilD
completely covers the top of the burning liquid
热门标签
最新试卷