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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 water
B
the only opening in a passageway is the one from which the nozzle is being advanced
C
pressure in the fire hose drops below 100 psi
D
a bulkhead collapses due to heat and pressure
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更多 “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” 相关考题
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考题
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AB
BC
CD
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考题
单选题When monitoring a system using /usr/bin/vmstat with an interval， the metrics under page pi and page po represent which of the following phrases？（）A
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考题
单选题High-velocity fog（）.A
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requires that the water pressure be no greater than 60 psiC
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考题
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
考题
单选题The spray of water in low-velocity fog will have（）.A
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考题
单选题A combination or all-purpose nozzle produces（）.A
low-velocity fog onlyB
a solid stream onlyC
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考题
单选题When monitoring a system using vmstat with an interval， the metrics under page po represent which of the following phrases？（）A
The number pages over the limitB
The pages to paging space per secondC
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relative humidityB
air temperatureC
barometric pressureD
absolute humidity
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单选题When approaching a fire from win ward, you should shield firefighters from the fire by using（）A
low-velocity fogB
high-velocity fogC
a straight stream of waterD
foam spray
考题
单选题When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the interface clock rate determined?（）A
It is supplied by the CSU/DSU.B
It is supplied by the far end router.C
It is determined by the clock rate command.D
It is supplied by the Layer 1 bit stream timing.
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