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

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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（）.

pressure builds up in the nozzle which causes a surge of water

the only opening in a passageway is the one from which the nozzle is being advanced

pressure in the fire hose drops below 100 psi

a bulkhead collapses due to heat and pressure

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相似问题和答案

第1题：

The high-velocity fog tip used with the all-purpose fire fighting nozzle should always be ______．

A.Attached by a chain

B.Coated with heavy grease to prevent corrosion

C.Painted red for identity as emergency equipment

D.Stored in the clip at each fire station

正确答案：A

第2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.

正确答案:A

第3题：

Which three are true about MPLS LSP establishment using RSVP?() (Choose three.)

A. Ordered Control

B. Independent Control

C. Down Stream Unsolicited

D. Liberal Label Management

E. Down Stream On Demand

参考答案：A, D, E

第4题：

In a Teleworker deployment with a single IP phone connected to a Cisco 831 router, select the true statement regarding Call Admission Control.（）

A、RSVP is a required configuration to support conference calls without voice packet loss.
B、The QoS configuration on the 831 router must always provision sufficient bandwidth for two RTP streams.
C、Call admission control is an issue only when using hardware DSP resources.
D、When using the conference call features on a 7960 IP phone, only one RTP stream is present regardless of how many extensions are on the conference.

正确答案:D

第5题：

Using output from "vmstat 2 8," which of the following options is most appropriate to consider when determining if a system is experiencing memory thrashing?（）

A、 cy != 1
B、 re != 0
C、 po/fr > 1/6
D、 fr/po > 1/6

正确答案:C

第6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

正确答案：B
烟或热量驱动走廊上的消防器，高速率雾蒸汽用于灭火，这种技术应仅用于有烟和热量的出口。

第7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、 The pages to and from paging space per second
B、 The page intervals and page operations per second
C、 The page interrupts and page operations per second
D、 The page segments transferred between pi and po devices per second

正确答案:A

第8题：

A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started?

A.When the towing vessel enters the fog

B.When the drilling rig enters the fog

C.When the towing vessel can no longer be seen from the rig

D.Immediately

正确答案：D

第9题：

Which three are true about MPLS LSP establishment using RSVP?（） (Choose three.)

A、Ordered Control
B、Independent Control
C、Down Stream Unsolicited
D、Liberal Label Management
E、Down Stream On Demand

正确答案:A,D,E

第10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 limit
B、 The pages to paging space per second
C、 The number of page operations per second
D、 The number of processes waiting for page out

正确答案:B

When using a high-velocity fog stream in a passageway，the po

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