【单选题】
光缆使用以下哪一种光缆型号被老鼠咬的可能性最少?___
A. GYTS
B. GYDA
C. GYFTY
D. GYTA33
E.
F.
查看试卷,进入试卷练习
微信扫一扫,开始刷题
答案
D
解析
暂无解析
相关试题
【单选题】
两台以太网交换机之间使用了两根5类双绞线相连,要解决其通信问题,避免产生环路问题,需要采用什么技术.( )___
A. 源路由网桥
B. 生成树网桥
C. MAC子层网桥
D. 介质转换网桥
E.
F.
【单选题】
光缆所有转角处必须用( )保护.___
A. 软管
B. 扎带
C. 铠装
D.
E.
F.
【单选题】
RADIUS协议当中,如果radius-server拒绝了认证的请求,那么它一般会在3号报文的哪个属性中体现出来拒绝的原因.( )___
A. 11号属性
B. 26-18属性
C. 18号属性
D. 26-19号属性
E.
F.
【单选题】
光缆线路日常维护中,标石除草培土的周期为( )___
A. 每年一次
B. 两年一次
C. 三年一次
D. 半年一次
E.
F.
【单选题】
光缆线路日常维护中,标石描漆描字的周期应为( )___
A. 每年一次
B. 两年一次
C. 每年两次
D.
E.
F.
【单选题】
光缆在敷设后 贴有标签,应标明编号,以便于分辨。标签书写应清晰,端正和正确。标签应选用不易损坏的材料。 ___
A. 一端
B. 两端
C. 不用
D. 以上都不对
E.
F.
【单选题】
光缆中断后链型组网下游网元的时钟会进入 ___
A. 正常状态
B. 跟踪状态
C. 自振状态
D. 保持状态
E.
F.
【单选题】
光路接头及各点损耗中,活动连接头损耗:( )dB/个。 ___
A. 0.2
B. 0.3
C. 0.4
D. 0.5
E.
F.
【单选题】
光猫正常工作的最小接收灵敏度为( )___
A. -14至-20dbm
B. -24至-27dbm
C. -24至-35dbm
D. -34至-44dbm
E.
F.
【单选题】
光网络网管,采用成熟的三层标准客户端-服务器端(Client-Server)结构的有:___
A. NES
B. B. RMS
C. C. T2000
D. D. RMS+
E.
F.
【单选题】
光纤到小区工程的技术用如下哪个技术缩写表达___
A. FTTH
B. FTTC
C. FTTB
D. FTTx
E.
F.
【单选题】
在现代网络管理模型中,( )是管理系统的心脏.___
A. 管理数据收集方式
B. 数据库
C. 管理方式
D. 采用的语言
E.
F.
【单选题】
光纤的使用寿命一般在( )年左右___
A. 10
B. B、20
C. C、30
D. D、40。
E.
F.
【单选题】
光纤分配箱是用户配线光缆的终端设备,用于配线光缆与 的连接(熔接或冷接)、存储、分配和调度。 ___
A. 主干光缆
B. 配线光缆
C. 用户引入光缆
D. 馈线光缆
E.
F.
【单选题】
RD4000在选择模式的时候,如果管道或电缆的深度太大,应该选择以下那个模式( )___
A. 窄带宽
B. 中带宽
C. 宽带宽
D.
E.
F.
【单选题】
光纤分为单模光纤与多模光纤,这两种光纤的区别是()___
A. A.单模光纤的纤芯大,多模光纤的纤芯小。
B. B.单模光纤比多模光纤采用的波长长。
C. C.单模光纤的传输频带窄,而多模光纤的传输频带宽。
D. D.单模光纤的光源采用发光二极管(LightEmittingDiode),而多模光纤的光源采用激光二极管(LaserDiode)。
E.
F.
【单选题】
光纤连接线不应与其他线缆一起布放。余长盘留曲率半径应不小于 mm___
A. 10
B. 20
C. 30
D. 40
E.
F.
【单选题】
光纤色散会 ( ) ___
A. 使带宽变宽
B. 限制传输距离
C. 提高光纤的传输容量
D. 提高通信质量
E.
F.
【单选题】
光纤收发器上以太口的默认设置是( )___
A. 100M全双工
B. 1000M全双工
C. 自适应
D. 10M全双工
E.
F.
【单选题】
光纤通信是以( )作为信息载体,利用光纤传输携带信息的光波,以达到通信之目的___
A. 光
B. B、光纤
C. C、光缆
D. D、电
E.
F.
【单选题】
光纤作为传输介质的主要特点是I.保密性好 II.高带宽 III.底误码率 Ⅳ.拓扑结构复杂___
A. I、II和IV ;
B. I、II和III;
C. II和Ⅳ;
D. III和IV。
E.
F.
【单选题】
光纤作为传输介质的主要特点是( )___
A. 拓扑结构复杂
B. 保密性好
C. 带宽高
D. 误码率低
E.
F.
【单选题】
两信令点相邻是指( )。___
A. 两局间有直达的信令链路
B. 两局间有直达的话路,不一定有直达的链路
C. 两局间有直达的话路和链路
D. 两局间话路和链路都不直达
E.
F.
【单选题】
光信号是以光功率来度量的,一般以 ( )为单位。___
A. mW
B. dB
C. dBm
D. dBW
E.
F.
【单选题】
光信号是以光功率来度量的,一般以( )为单位.___
A. dBW
B. Mw
C. Db
D. dBm
E.
F.
【单选题】
光信号是以光功率来度量的,一般以()为单位。___
A. dBW
B. B.Mw
C. C.Db
D. D.dBm
E.
F.
【单选题】
PPPOED流程中的心跳包信令为( )___
A. PADS
B. PADI
C. PADO
D. LCP
E.
F.
【单选题】
RIP是哪种协议的缩写___
A. Routing Information Protocol
B. Ruling Internal Protocol
C. Role of Interior Protocol
D.
E.
F.
【单选题】
光信号在光纤中传输的距离要受到什么的双重影响()___
A. A.色散,光功率
B. B.衰耗,信噪比
C. C.色散,损耗
D. D.光功率,信噪比
E.
F.
【单选题】
光源和光功率计在光缆施工和维护中一般是在一起使用,可以测量中继段的( )___
A. 平均损耗
B. 全程损耗
C. 单点损耗
D.
E.
F.
【单选题】
国标规定,DWDM系统上线路的光功率最大不能超过()dB___
A. 15
B. 18
C. 20
D. 23
E.
F.
【单选题】
国标要求厂验接收机灵敏度的余度为 ( )___
A. 0dB
B. 1dB
C. 2dB
D. 3dB
E.
F.
【单选题】
国标要求的S-16.1光接口的过载点是( )___
A. -8dB
B. -9dB
C. -5dB
D. 0dB
E.
F.
【单选题】
路由器工作在OSI参考模型的( )___
A. 物理层
B. 数据链路层
C. 网络层
D. 应用层
E.
F.
【单选题】
国际上负责分配IP地址的专业组织划分了几个网段作为私有网段,可以供人们在私有网络上自由分配使用,以下不属于私有地址的网段是( )___
A. 10.0.0.0/8
B. 172.16.0.0/12
C. 192.168.0.0/16
D. 224.0.0.0/8
E.
F.
【单选题】
国家标准《出入口控制系统工程设计规范》50396-2007关于门禁系统设计基本要求备用电源应保证系统连续工作不少于___
A. 12小时
B. 24小时
C. 32小时
D. 48小时
E.
F.
【单选题】
国家机关或者金融、电信、交通、教育、医疗等单位的工作人员,违反国家规定,将本单位在履行职责或者提供服务过程中获得的公民个人信息,出售或者非法提供给他人,情节严重的,处( )有期徒刑或者拘役,并处或者单处罚金。___
A. 五年以下
B. 三个月以下
C. 一年以下
D. 三年以下
E.
F.
【单选题】
衡量互联网专线业务的重要性能主要指标不包括( )___
A. 可用带宽
B. 时延
C. 丢包率
D. 光功率
E.
F.
【单选题】
衡量数字通信系统传输质量的指标是_____。___
A. 误码率
B. 信噪比
C. 噪声功率
D. 话音清晰度
E.
F.
【单选题】
RIP通过( )报文交换路由信息___
A. TCP
B. UDP
C. IP
D. IPX
E.
F.
推荐试题
【单选题】
He is ___ about his chances of winning a gold medal in the Olympics next year.
A. outstanding
B. optional
C. optimistic
D. obvious
【单选题】
The president could not go to the meeting, so Mr. Smith___ him.
A. recorded
B. renewed
C. represented
D. recalled
【单选题】
He wrote an article criticizing the Greek poet and won ___and a scholarship.
A. faith
B. prestige
C. status
D. courage
【单选题】
Jane was hit on the head by the robber and was knocked___.
A. mindless
B. unaware
C. brainless
D. unconscious
【单选题】
It is our___policy that we will achieve unity through peaceful means.
A. consistent
B. continuous
C. considerate
D. continual
【单选题】
The author of the report is well___with the problems in the hospital because he has been working there for many years.
A. informed
B. acquainted
C. enlightened
D. acknowledged
【单选题】
The manager lost his ___ just because his secretary was ten minutes late.
A. mood
B. temper
C. mind
D. passion
【单选题】
Many Europeans___ the continent of Africa in the 19th century.
A. exploded
B. explored
C. exposed
D. expanded
【单选题】
If you hear such a rumor,___ it thoroughly.
A. seek
B. investigate
C. search
D. explore
【单选题】
The pressure ___causes Americans to be energetic, but it also puts them under a constant emotional strain.
A. to compete
B. competing
C. to be competed
D. having competed
【单选题】
Having decided to rent a flat, we ___ contacting all the accommodation agencies in the city.
A. set about
B. set on
C. set out
D. set up
【单选题】
The old couple decided to ___ a boy and a girl though they had three children of their own.
A. adapt
B. adjust
C. adept
D. adopt
【单选题】
Mike was being ___for violent tendencies.
A. contended
B. consulted
C. counselled
D. insulted
【单选题】
I will___ Mr. Walters on this point.
A. refer to
B. commit to
C. contribute to
D. defer to
【单选题】
What happens in the next few days is___to our success.
A. critical
B. critic
C. prior
D. valid
【单选题】
She won’t___that there is a problem.
A. confer
B. concern
C. acknowledge
D. contemplate
【单选题】
This offer is___ for travel before the end of April.
A. effective
B. ineffective
C. invalid
D. valid
【单选题】
___ to British universities depends on examination results.
A. Admittance
B. Entry
C. Admission
D.
E. ntrance
【单选题】
The database is only ___ by authorized managers.
A. proved
B. accessible
C. approved
D. access
【单选题】
This traditional ___ is of indigo blue.
A. clothes
B. diversity
C. costume
D. institution
【单选题】
These cigarettes are a ___ of the best tobaccos.
A. blend
B. band
C. mixture
D. mess
【单选题】
The tennis players need total ___ during play.
A. concentration
B. section
C. depression
D. energy
【单选题】
He ___ that he was innocent.
A. announced
B. declared
C. disclosed
D. admitted
【单选题】
Columbus discovered America but did not ___ the new continent.
A. seek
B. investigate
C. search
D. explore
【单选题】
The trees ___their foliage every year.
A. repeat
B. grow
C. refresh
D. renew
【单选题】
Make a list of the various ___.
A. options
B. choice
C. optional
D. samples
【单选题】
I am well aware that this is a ___ job.
A. rough
B. tough
C. wealthy
D. rogue
【单选题】
I found their kindness quite ___.
A. strong
B. overweening
C. keen
D. overwhelming
【单选题】
The captain wasn’t ___ on having him in the team.
A. eager
B. keen
C. overwhelmed
D. anxious
【单选题】
He was ___at the prospect of seeing them again.
A. thrilling
B. blessed
C. thrilled
D. emotional
【单选题】
They ___ against travelling at night in such a dangerous country.
A. consul
B. advocate
C. counsel
D. recommend
【单选题】
It is absolutely vital that food supplied should be ___.
A. sustained
B. enhanced
C. exhausted
D. maintained
【单选题】
He must have had an accident, or he ___ then.
A. would have been here
B. had to be here
C. should be here
D. would be here
【单选题】
It was essential that the application forms ___ back before the deadline (截止日期).
A. must be sent
B. would be sent
C. be sent
D. were sent
【单选题】
We ___ our breakfast when an old man came to the door.
A. just have had
B. have just had
C. just had
D. had just had
【单选题】
The bridge was named ___ the hero who gave his life for the cause of the people.
A. after
B. with
C. by
D. from
【单选题】
It wasn’t such a good dinner ___ she had promised us.
A. that
B. which
C. as
D. what
【单选题】
The road now ___two kilometers beyond the river.
A. develops
B. extends
C. expands
D. widens
【单选题】
It was claimed that the level of alcohol in the man’s blood was ___ to cause an accident.
A. sufficient
B. adequate
C. enough
D. accurate
【单选题】
Medical care reform has become this country’s most important public health ___.
A. question
B. stuff
C. matter
D. problem