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单选题
As an extinguishing agent，foam（）.
A
conducts electricity
B
should be directed at the base of the fire
C
is most effective on burning gases which are flowing
D
extinguishes by cooling oil fires below ignition temperature
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单选题A class B fire is most successfully fought by（）.A
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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
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单选题Generally, the first action in extinguishing an LFG fire caused by escaping gas is to（）.A
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单选题Water is a very effective fire extinguishing agent because it（）A
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单选题Which extinguishing agent is the best for use on electrical fires?（）A
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Water streamB
Water fog or aprayC
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FoamB
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单选题What is the most important characteristic of the extinguishing agent in fighting a class C fire?（）A
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单选题Which of the following statements is true concerning Halon 1301 fire extinguishing equipment?（）A
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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
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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
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考题
多选题On what conditions may an exemption certificate，exempting from the requirement to install a fixed fire extinguishing system in a cargo space，be issued？（）AThe ship is constructed and solely intended for carriage of ore， coal， grain， unseasoned timber， non-combustible cargoes or cargoes which according to the Administration constitute a low fire riskBSteel hatch covers and effective means of closing all ventilators and other openings to the cargo space are fittedCA fixed deck foam system is be fitted in lieu of the cargo space extinguishing systemDThe vessel is less than 10 000 gross tonnage
考题
单选题An extinguishing agent which effectively cools，dilutes combustible vapors，removes oxygen，and provides a heat and smoke screen is（）.A
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cannot be made with salt waterB
is heavierthan oil and sinks below its surfaceC
is corrosive and to fire fightersD
conducts electricity
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sweep flames away with water sprayB
shut off the leakC
use a chemical foam fire extinguisherD
call the local fire department
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单选题Where foam extinguishing systems are provided on a ship，each machinery flat in the protected space must have a(n)（）.A
coamingB
alarmC
drainD
fire sensor
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