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单选题
A high-velocity fog stream can be used in fire fighting situations to drive heat and smoke ahead of the fire fighters in a passageway. This technique should only be used when（）.
A
using a 2-1/2 inch hose
B
there is an outlet for the smoke and heat
C
the fire is totally contained by the ship's structure
D
at least two fog streams can be used
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更多 “单选题A high-velocity fog stream can be used in fire fighting situations to drive heat and smoke ahead of the fire fighters in a passageway. This technique should only be used when（）.A using a 2-1/2 inch hoseB there is an outlet for the smoke and heatC the fire is totally contained by the ship's structureD at least two fog streams can be used” 相关考题
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单选题If you are fighting a fire below the main deck of your vessel，which action is most important concerning the stability of the vessel?（）.A
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考题
单选题If a firefighting situation calls for low-velocity fog you would（）.A
order the engine room to reduce pressure on the fire pumpB
put the lever on an all-purpose fire nozzle all the way forwardC
attach a low-velocity fog applicator with the nozzle shut downD
put the lever on an all-purpose fire nozzle all the way back
考题
单选题The straight stream capability of an all-purpose nozzle is used in fighting a class A fire to（）.A
shield fire fighters from radiant heatB
break up burning materialC
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drive heat and smoke ahead of the fire fighters
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generatorsB
oil drumsC
the bridge controlsD
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单选题If you are fighting a fire below the main deck of your vessel，which action is most importantconcerning the stability of the vessel? （）A
Shutting off electricity to damaged cablesB
Pumping fire-fighting water overboardC
Maneuvering the vessel so the fire is on the lee sideD
Removing burned debris from the cargo hold
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
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单选题High-velocity fog（）.A
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requires that the water pressure be no greater than 60 psiC
produces an effective fog pattern no more than 6 feet beyond the nozzleD
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单选题What is an advantage of using foam in fire fighting?（）A
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It absorbs heat from materials that could cause reignitionC
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Once the surface is blanketed with foam and the fire is extinguished，no further foam is required
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Dry chemical powderC
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考题
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all fire-fighting equipment is at the sceneC
the fixed systems are activatedD
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单选题According to the SOLAS convention, the bilge water system （）A
must connect the bilge well suction directlyB
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should connect to the fire fighting system directly
考题
多选题Which of the following statements are true？ （）ARC4 is a stream cipherBStream ciphers require paddingCAES is a block cipherDDES and 3DES are stream ciphersEAES is a stream cipherFAES， DES， and 3DES can be used as HMAC algorithms
考题
单选题When using a high-velocity fog stream in a passageway，the possibility of a blow back must be guarded against. Blow back is most likely to occur when（）.A
pressure builds up in the nozzle which causes a surge of waterB
the only opening in a passageway is the one from which the nozzle is being advancedC
pressure in the fire hose drops below 100 psiD
a bulkhead collapses due to heat and pressure
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stop ventilation to the areaB
stop the vesselC
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over the top of the flamesB
off a bulkhead into the fireC
in front of the fireD
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单选题The preferred agent used in fighting a helicopter crash fire is（）.A
CO2B
dry chemicalC
waterD
foam
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