【单选题】
Would you mind keeping a（n）__________on the house for us while we are away？___
A. eye
B. /look
C. hand
D. view
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相关试题
【单选题】
He suggested the sports meet be _______because of the bad weather. ___
A. put away
B. put up
C. put down
D. put off
【单选题】
If the weather is __________ suitable, we will play the football match on Tuesday. ___
A. by means of
B. by any means
C. by no means
D. by all means
【单选题】
_____________is one of the five working languages at U.N. , which _______ are very proud of.___
A. The Chinese, the Chinese
B. Chinese language, Chinese
C. Chinese, the Chinese
D. Chinese language, the Chinese
【单选题】
The war lasted so long that people were tired of it. Everyday there was large crowds of demonstrators _____against the war.___
A. protecting
B. prescribing
C. protesting
D. prosecuting
【单选题】
Tom is so talkative. I’m sure you'll soon get tired ________ him.___
A. of
B. with
C. at
D. on
【单选题】
He ________ driving me home, even though I told him I lived nearby.___
A. insisted on
B. insisted at
C. insisted that
D. insisted in
【单选题】
We came finally ______ the conclusion that she has been telling lies all the time.___
A. of
B. into
C. to
D. at
【单选题】
I am not used to speaking ________ public.___
【单选题】
I didn’t know what to do, but then an idea suddenly ________to me.___
A. appeared
B. happened
C. occurred
D. emerged
【单选题】
Measles （麻疹） ________ a long time to get over.___
A. spend
B. spends
C. take
D. takes
【单选题】
A pair of spectacles ________ what I need at the moment.___
A. is
B. are
C. has
D. have
【单选题】
I fell and hurt myself while I ________ basketball yesterday.___
A. was playing
B. am playing
C. play
D. played
【单选题】
Don't forget _________ the window before leaving the room.___
A. to have closed
B. to close
C. having closed
D. closing
【单选题】
Twenty people were______ wounded in the air crash.___
A. quickly
B. wrongly
C. bitterly
D. seriously
【单选题】
The top of the Great Wall is ________ for five horses to go side by side.___
A. wide
B. so wide
C. wide enough
D. enough wide
【单选题】
Nancy is considered to be _________ the other students in her class.___
A. less intelligent
B. the most intelligent
C. intelligent as well
D. as intelligent as
【单选题】
She is not only my classmate __________ also my good friend.___
A. or
B. but
C. and
D. too
【单选题】
I would like to do the job ________ you don't force me to study.___
A. in case
B. although
C. though
D. as long as
【单选题】
__________ she survived the accident is miracle.___
A. What
B. That
C. As
D. Which
【单选题】
I often see _________ the road on his way home.___
A. he cross
B. him cross
C. him crossed
D. he crossing
【单选题】
The workers are busy __________ models for the exhibition.___
A. to make
B. with making
C. being making
D. making
【单选题】
The higher the temperature, __________ the liquid evaporates.___
A. the faster
B. the more fast
C. the slower
D. the more slower
【单选题】
Australia is one of the few countries ___________ people drive on the left of the road.___
A. which
B. that
C. where
D. on which
【单选题】
The grey building is the place where the workers live, and the white building is the place where the spare parts _________ .___
A. are producing
B. are produced
C. produced
D. being produced
【单选题】
Once environmental damage ___________, it takes many years for the system to recover.___
A. is to do
B. does
C. had done
D. is done
【单选题】
We worked hard and completed the task ________.___
A. in the time
B. on the time
C. ahead of time
D. before time
【单选题】
I didn't expect you to turn __________ at the meeting yesterday.___
A. up
B. to
C. out
D. over
【单选题】
Mike is better than Peter _________ swimming.___
【单选题】
Eggs, though rich in nourishments, have ___________ of fat.___
A. a large number
B. the large number
C. a large amount
D. the large amount
【单选题】
His salary as a driver is much higher than _____________.___
A. a porter
B. is a porter
C. as a porter
D. that of a porter
【单选题】
I have been looking forward to__________ from my parents.___
A. hear
B. being heard
C. be heard
D. hearing
【单选题】
The manager will not __________ us to use his car.___
A. have
B. let
C. agree
D. allow
【单选题】
__________ her and then try to copy what she does.___
A. Mind
B. See
C. Stare at
D. Watch
【单选题】
It's bad __________ for you to smoke in the public places where smoking is not allowed.___
A. behavior
B. action
C. manner
D. movement
【单选题】
— I think John and Peter will.___
A. carry out
B. get through
C. take in
D. set aside
【单选题】
If she wants to keep slim, she must make a ________ in her diet.___
A. change
B. turn
C. run
D. go
【单选题】
___________ the War of Independence, the United States was an English colony.___
A.
B. efore B. At
C. In
D. Between
【单选题】
A police officer claimed he had attempted to _________ paying his fare.___
A. avoid
B. reject
C. refuse
D. neglect
【单选题】
He is not seriously ill, but only a _________ headache.___
A. obvious
B. delicate
C. slight
D. temporary
【单选题】
On average, a successful lawyer has to talk to several _________ a day.___
A. customers
B. supporters
C. guests
D. clients
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【单选题】
移频电源检测盒的报警电路是由四个电压检测电路和四个光电耦合器组成的___ 电路构成的。
A. 与门
B. 与非门
C. 或门
D. 异或门
【单选题】
为了满足移频接收设备采用双机并联运用，必须在限放前增加一级___ 电路。
A. 放大
B. 反相
C. 射级跟随器
D. 阻容耦合
【单选题】
双稳态触发器的返还系数一般要求大于 ___ ，此值越大，设备的抗干扰能力越强。
A. 75%
B. 85%
C. 90%
D. 95%
【单选题】
移频地面发送设备，当交流电压在220±22V范围内变动时，载频漂移不大于___。
A. ±3Hz
B. ±4Hz
C. ±5Hz
D. 9Hz
【单选题】
移频衰耗器初级线圈1、2的输入阻抗Z1为4Ω～4.5Ω，当RT从0变到∞时，此值变化范围在___ 之间。
A. 4Ω～4.3Ω
B. 4.12Ω～4.6Ω
C. 4.12Ω～4.74Ω
D. 4.12Ω～4.85Ω
【单选题】
当交流电压为242V 直流电压为24.5V. ，移频发送盒负载电阻为0.85Ω时，功放输出电压应不小于___ 。
A. 2.1V
B. 5.6V
C. 13V
D. 13.6V
【单选题】
检修移频发送盒时要求上、下边频频偏均不大于___ 。
A. ±4Hz
B. ±5Hz
C. ±5.5Hz
D. ±6Hz
【单选题】
ZPW1-18型无绝缘移频自动闭塞设备，通过发送、接收电缆盒的电缆补偿，使实际电缆长度与模拟电缆长度之和为 ___ ，以利于移频信号的传输和调整。
A. 10km
B. 17.5km
C. 19km
D. 21km
【单选题】
ZD9转辙机当滚轮在动作板上滚动时，启动片尖端离开速动片上平面的间隙应为 ___ 。
A. 0.3mm～0.8mm
B. 0.5mm～1.7mm
C. 0.3mm～2mm
D. 1mm～3mm
【单选题】
移频自动闭塞交流电压的允许波动范围是 ___ 。
A. ±15V
B. ±18V
C. ±20V
D. ±22V
【单选题】
18信息N+1移频自动闭塞区间发送盒的输出功率为 ___ 。
A. 10VA
B. 20VA
C. 30VA
D. 40VA
【单选题】
ZD9转辙机当锁闭杆从终端往回移动，锁闭杆斜面与检查柱斜面接触后，锁闭杆再移动 ___ 时，表示接点组应可靠断开开关的常闭接点。
A. 12mm
B. 20mm
C. 30mm
D. 40mm
【单选题】
载频中心为550Hz时，移频波的能量主要分布在495Hz、605Hz频率的附近，这说明频偏为 ___ 。
A. 50Hz
B. 55Hz
C. 60Hz
D. 65Hz
【单选题】
继电半自动闭塞电源停电恢复时，只有用 ___ 办理，方能使闭塞机恢复。
A. 事故按钮
B. 总人工解锁按钮
C. 总取消按钮
D. 总定位按钮
【单选题】
继电半自动闭塞采用架空线时，其直流电阻每条公里___ 。
A. 9Ω
B. 11Ω
C. 14Ω
D. 20Ω
【单选题】
继电半自动闭塞采用架空线时，其直流电阻经运用腐蚀后最大不超过 ___ 。
A. 10.7Ω
B. 12.7Ω
C. 13.7Ω
D. 14.7Ω
【单选题】
自动站间闭塞,当列车出发后,出站信号机应 ___ 。
A. 自动关闭
B. 手动关闭
C. 经值班员联系后关闭
D. 自动开放
【单选题】
自动站间闭塞,当列车出发后,闭塞解除前,两站向该区间的出站信号机 ___ 。
A. 不得再次开放
B. 可以再次开放
C. 自动关闭
D. 灭灯
【单选题】
自动站间闭塞,列车到达接车站,经过检查区间空闲后,闭塞 ___ 。
A. 自动解除
B. 手动解除
C. 经过值班员联系后解除
D. 不需解除
【单选题】
区间正线上的 ___ 须与有关信号机或闭塞设备联锁。
A. 轨道电路
B. 点灯单元
C. 道岔
D. 机车信号
【单选题】
ZD6转辙机速动爪与速动片的间隙，在解锁时不小于 ___ 。
A. 0.2mm
B. 1.2mm
C. 1.5mm
D. 2mm
【单选题】
ZD6转辙机速动爪与速动片的间隙，在锁闭时为 ___ 。
A. 0.3mm～1.7mm
B. 0.5mm～1.7mm
C. 0.3mm～2mm
D. 1mm～3mm
【单选题】
在无任何道岔动作时，电动转辙机电源对地电流不得大于___ 。
A. 0.5mA
B. 1mA
C. 1.5mA
D. 2mA
【单选题】
继电器电源对地电流不得大于___ 。
A. 1mA
B. 1.5mA
C. 2mA
D. 10mA
【单选题】
下列关于接地导线说法错误的是 ___ 。
A. 接地导线上严禁设置开关
B. 接地导线上严禁设置熔断器或断路器
C. 可以用钢轨代替地线
D. 严禁用钢轨代替地线
【单选题】
把两个5Ω的电阻串联与10Ω的电阻并联则总电阻为___ 。
A. 5Ω
B. 10Ω
C. 15Ω
D. 20Ω
【单选题】
在晶体三极管放大电路中，晶体三极管最高电位的一端应该是___ 。
A. PNP型的基极
B. NPN的基极
C. PNP型的发射极
D. NPN的发射极
【单选题】
对于半波整流电路，整流系数为 ___ 。
A. 0.45
B. 0.60
C. 0.75
D. 0.9
【单选题】
计算机能直接执行的程序是___ 。
A. 源程序
B. 机器语言程序
C. 高级语言程序
D. 汇编语言程序
【单选题】
根据___ ，可将光纤分为单模光纤和多模光纤。
A. 光纤的粗细
B. 光纤的传输速率
C. 光纤的传输距离
D. 光在光纤中的传播方式
【单选题】
网卡是一个计算机与 ___ 相连的设备。
A. 接口
B. 存储器
C. 计算机
D. 传输介质
【单选题】
___ 不是路由器的特点。
A. 用于连接大型的网络
B. 用于互连多个类型互不相同的网络
C. 具有协议转换的功能
D. 信息处理速度比网桥快
【单选题】
一般根据总线的类型不同，网卡可分为 ___ 。
A. ISA网卡、EISA网卡、PCI网卡
B. ATM网卡、环牌网卡、以太网卡
C. 10M网卡、100M网卡、10/100M网卡
D. 工作站网卡、服务器网卡、笔记本网卡
【单选题】
接口数是集线器的一个参数，12口集线器中的12是指 ___ 。
A. 可以连接的网络个数
B. 集线器中所有的端口数
C. 所能连接的工作站数目
D. 所能连接的服务器的数目
【单选题】
电池A电动势为2V，内阻为1Ω，电池B电动势为2.5V，内阻为2.5Ω，先后用A、B作电源向同一电阻供电，电流相等，这个电阻阻值R= ___ 。
A. 0.5Ω
B. 1.25Ω
C. 2.5Ω
D. 5Ω
【单选题】
ZYJ7-L220/4000电液转辙机动作时间不大于___ 。
A. 3.8s
B. 5s
C. 8s
D. 10.5s
【单选题】
ZYJ7-N220/1800电液转辙机动作时间不大于 ___ 。
A. 3.8s
B. 5s
C. 8s
D. 12s
【单选题】
ZYJ7GZ-220/1800电液转辙机动作时间不大于 ___ 。
A. 3.8s
B. 5s
C. 8.5s
D. 12s
【单选题】
ZD9型电动转辙机电源电压为直流___ 。
A. 160V
B. 180V
C. 200V
D. 220V
