【单选题】
(76266)接触器中灭弧装置的作用是_____。[222210511]___
A. 防止触头烧毛或熔焊
B. 加快触头分断速度
C. 减小触头电流
D. 减小电弧引起的反电势
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相关试题
【单选题】
(76267)热继电器工作时，其热元件应串联在_____。[211210511]___
A. 控制电路公共支路上
B. 主电路中
C. 接触器线圈中
D. 不能确定
【单选题】
(76268)KLC40C[2]-1T1型空调控制柜温度控制器自动制冷工况上限值设定为_____℃。[223210540]___
【单选题】
(76269)请KLC40C[2]-1T1型空调控制柜温度控制器自动采暖工况上限值设定为_____℃。[221210540]___
【单选题】
(76270)ZF系列电开水炉的供电电源为_____。[322210504]___
A. 直流110V
B. 交流220V
C. 三相交流380V
D. 交流450V
【单选题】
(76271)客室加热器罩的表面温度不得超过_____℃。[211210504]___
【单选题】
(76272)客车使用的轴温报警器主要有三种类型，其关键区别在于_____不同。[211210535]___
A. 报警方式
B. 结构
C. 轴温传感器
D. 温度显示范围
【单选题】
(76273)BY-2A型客车荧光灯逆变器输出功率为_____W。[321210517]___
【单选题】
(76274)BY-2B型客车荧光灯逆变器输出功率为_____W。[322210517]___
【单选题】
(76275)BY-2C型客车荧光灯逆变器输出功率为_____W。[323210517]___
【单选题】
(76276)BY-2D型客车荧光灯逆变器输出功率为_____W。[311210517]___
【单选题】
(76277)客车空调装置中电动机的过载保护一般采用_____。[321210519]___
A. 热继电器
B. 接触器
C. 空气开关
D. 可控硅
【单选题】
(76278)起动电动机时，自动空气开关立即分断的原因是_____。[321210506]___
A. 过电流脱扣器瞬时动作整定电流太小
B. 过电流脱扣器瞬时动作整定电流太大
C. 铁心工作面有油污，短路环断裂
D. 失压脱扣器无电压
【单选题】
(76279)YZ22型客车两端设有电气连接器，其安装规定为_____。[322210501]___
A. 1、4位为插座，2、3位为插头
B. 1、3位为插座，2、4位为插头
C. 1、2位为插座，3、4位为插头
D. 不能确定
【单选题】
(76280)厂修客车车电固定设备应保证_____内车下配线及车上干线，不因检查、修理不当而影响安全使用。[323210516]___
A. 1年
B. 2年
C. 3年
D. 一个厂修期
【单选题】
(76281)轴温报警器轴位线路短路时，光屏温度显示为_____。[212210535]___
【单选题】
(76282)轴温报警器轴位线路开路时，光屏温度显示为_____。[213210535]___
【单选题】
(76283)正目前,客车常用的车钩有_____两种.[323210501]___
A. 1号、15号
B. 2号、13号
C. 1号、15G型
D. 13号、15号
【单选题】
(76284)凡铁道部所属车辆均应涂打_____标记[321210502]___
【单选题】
(76285)由前向后投影所得的视图是_____。[213210504]___
A. 俯视图
B. 主视图
C. 左视图
D. 右视图
【单选题】
(76286)列车冲突，但损害后果不够大事故的为_____。[321210503]___
A. 一般事故
B. 险性事故
C. 事故苗子
D. 不算事故
【单选题】
[321210501]___
A. 列检人员
B. 调车作业人员
C. 机车乘务组
D. 运转车长
【单选题】
(76288)我国车辆上最普遍采用的缓冲器是_____缓冲器。[221210504]___
A. 弹簧式
B. 摩擦式
C. 橡胶
D. 液压
【单选题】
(76289)请输我国规定工业交流用电的频率采用_____HZ。[312110501]___
【单选题】
(76290)客车采暖时间由铁路局根据_____制定，并通知有关铁路局，抄报铁道部。[213210504]___
A. 规定时间
B. 气候情况
C. 开车运行情况
D. 开车运行区域
【单选题】
(76291)需在待发列车后部存放机车、车辆、动车及重型轨道车时（包括在列车尾部摘下的车辆），对有列检作业的列车，应距列车_____m及其以上。[2132105101]___
【单选题】
(76292)请输入试题在站内线路上检查、修理、整备车辆或进行装卸作业时，应按《技规》第359条设置防护信号，移动式防护信号的设置地点，应控制在距离停留车辆_____之间。[311210511]___
A. 10—20m
B. 20—30m
C. 15—20m
D. 25—30m
【单选题】
(76293)在带电的接触网线路上，登上车辆制动台的人员与接触网的带电部分，需保持_____以上的距离，禁止登上棚车制动台。[322210511]___
A. 1000mm
B. 1500mm
C. 2000mm
D. 2500mm
【单选题】
(76294)在超过_____坡道的线路上停留车辆时，须采取拧紧两端车辆人力制动机并以铁鞋牢靠固定。[212210511]___
A. 1.5‰
B. 2.5‰
C. 3.5‰
D. 4.5‰
【单选题】
(76295)列车长度超过列车运行图规定换长_____以上时，为超长列车。[223210511]___
【单选题】
(76296)停留在尽头线上的车辆，须与车挡至少保持_____距离，设有挡车器时，车辆不得碰撞挡车器。[212210511]___
A. 10m
B. 15m
C. 20m
D. 25m
【单选题】
(76297)请输康尼塞拉门有电、有气时用三角钥匙操作装置不能打开和关闭车门的原因是_____[321210515]___
A. 机械故障
B. 微动开关损坏
C. 内操作损坏
D. 外操作损坏
【单选题】
(76298)康尼塞拉门未关到位即自动返回是什么原因_____[322210515]___
A. 防挤压压力开关设定压力太大
B. 防挤压压力开关设定压力太小
C. 与防挤压压力开关无关
D. 拉手有问题
【单选题】
(76299)塞拉门内操作能开锁而处操作不能开锁的原因是_____[323210515]___
A. 外操作上牵拉钢丝绳的夹头过紧
B. 内操作上牵拉钢丝绳的夹头松动
C. 外操作上牵拉钢丝绳的夹头松动
D. 内操作上牵拉钢丝绳的夹头过紧
【单选题】
(76300)由铁路电气化接触网供电的空调客车，照明和通风机电机采用_____供电。[223210511]___
A. 交流220V
B. 直流110V
C. 交流110V
D. 蓄电池
【单选题】
(76301)我国铁路电气化接触网供电的额定电压为单相工频_____V。[223210511]___
A. 1000
B. 1500
C. 3000
D. 25000
【单选题】
(76302)25K型快速客车车辆内部结构和设备具有良好的_____性能。[221210511]___
A. 阻燃防火
B. 通风采暖
C. 防热抗寒
D. 舒适
【单选题】
(76303)25K型快速客车车体钢结构系_____筒体承载结构。[222210511]___
A. 有中梁簿壁
B. 无中梁簿壁
C. 有中梁厚壁
D. 无中梁厚壁
【单选题】
(76304)25K型车制动系统为双管制，正常情况下空气弹簧的用风为_____供给。[223210511]___
A. 制动管
B. 总风缸
C. 总风管
D. 副风缸
【单选题】
(76305)在电气化区段，乘务员所携带的任何物件与接触网设备的带电部分应保持_____m以上的距离。[212210611]___
【单选题】
(76306)25K型车辆的检修修程根据走行公里数来划分如A3修为（）万公里[323210511]___
A. 40±20
B. 40±10
C. 80±20
D. 240±40
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【填空题】
52.即可用作深基坑的支护结构，又可作为深基坑的支护和建筑物地下室外墙的是___。
【填空题】
53.砌筑用脚手架是砌筑过程中堆放材料和工人进行操作的___。
【填空题】
54.混凝土浇筑包括___和___两个过程。
【填空题】
55.无粘结预应力混凝土结构在张拉后容许预应力筋对周围混凝土发生___滑动。
【填空题】
56.斜拉桥是新型的桥梁形式，这种形式大桥的主桥分为___和___两大部分。
【填空题】
57.___和___是国际通行的工程建设项目组织实施方式。
【填空题】
58.BIM 中的图形是赋予了___属性的实体。
【填空题】
59.BIM 是指建筑物在设计和建造过程中，创建和使用的“___”。
【单选题】
The word "wag" (Line 1, Para.1) most probably means _________.
A. move
B. shake
C. bite
D. play
【单选题】
The video cameras were used to catch the dogs' responses because ___________.
A. the dogs were put in the wooden boxes
and tested one at a time
B. it was easier to catch the dogs’s response changes in the tail wagging
C. they enabled the dogs’owners to know
about their dogs’; habit
D. the dogs wagged their tails in different
directions when they were in different
moods
【单选题】
When there are no stimuli, a dog will ___________.___
A. wag to the right
B. no wag at all
C. wag to the left
D. wag to the left and then wag to the right
【单选题】
The purpose of doing the experiment is _________.___
A. to train dogs for their owners
B. to help dogs find companion
C. to help people choose their pet dogs
D. to help people judge the mood of dogs
【单选题】
The underlined word "they" in the last sentence refers to __________.___
A. the trainers
B. the systems
C. the researchers
D. the dogs
【单选题】
The new law passed in Rome will ________.___
A. help improve fishing environment
B. stop people from catching goldfish
C. guarantee better conditions for goldfish
D. discourage keeping goldfish at home
【单选题】
People in Rome believe that the civilization of a city can be judged by _________.___
A. awareness of animal protection
B. exchanges with other cities
C. protection of ancient ruins
D. recognition of animal lovers
【单选题】
The underlined word "compassion" in Para 2 is the closest in meaning to __________.___
A. support
B. pity
C. help
D. love
【单选题】
People may break the law in Turin if they ________.___
A. keep their dogs or cats in cars
B. shut their dogs home all day long
C. raise their cats near ancient ruins
D. feed homeless animals in car parks
【单选题】
We can infer from the passage that _________.___
A. the owners can leave their dogs in hot cars
B. the cat only lives in modern life
C. the new law can prevent cruelty to animals
D. the new law gives recognition to the
people who feed homeless cat
【单选题】
If a person finds getting up early a problem, most probably ________.___
A. he is a lazy person
B. he refuses to follow his own energy cycle
C. he is not sure when his energy is low
D. he is at his peak in the afternoon or evening
【单选题】
Which of the following may lead to family quarrels according to the passage?___
A. Unawareness of energy cycles.
B. Familiar monologues.
C. A change in a family member's energy cycle.
D. Attempts to control the energy cycle of other family members.
【单选题】
If one wants to work efficiently at his low point in the morning, he should __________.___
A. change his energy cycle
B. overcome his laziness
C. get up earlier than usual
D. go to bed earlier
【单选题】
You are advised to rise with a yawn and stretch because it will __________.___
A. help to keep your energy for the day's work
B. help you to control your temper early in the day
C. enable you to concentrate on your routine work
D. keep your energy cycle under control all day
【单选题】
Which of the following statements is NOT true?___
A. Getting off to work with a minimum effort helps save one's energy.
B. Dr. Kletman explains why people reach their peaks at different hours of day.
C. Habit helps a person adapt to his own energy cycle.
D. Children have energy cycles, too.
【单选题】
An effective way to prevent the burnout of young athletes is __________.___
A. to increase their sense of success
B. to make sports less competitive
C. to reduce their mental stress
D. to make sports more challenging
【单选题】
According to the passage sport is positive for young people in that __________.___
A. it can help them learn more about society
B. it enables them to find flaws in themselves
C. it teaches them how to set realistic goals for themselves
D. it can provide them with valuable experiences
【单选题】
Many coaches and parents are in the habit of criticizing young athletes __________.___
A. without realizing criticism may destroy their self-confidence
B. in order to make them remember life's lessons
C. believing that criticism is beneficial for their early development
D. so as to put more pressure on them
【单选题】
According to the passage parents and coaches should __________.___
A. help children to win every game
B. pay more attention to letting children enjoy sports
C. train children to cope with stress
D. enable children to understand the positive aspect of sports
【单选题】
The author's purpose in writing the passage is _________.___
A. to persuade young children not to worry about criticism
B. to stress the importance of positive reinforcement to children
C. to discuss the skill of combining criticism with encouragement
D. to teach young athletes how to avoid burnout
【单选题】
As pointed out at the beginning of the passage, people used to think that air pollution _______.___
A. cause widespread damage in the countryside
B. affected the entire eastern half of the United States
C. had damaged effect on health
D. existed merely in urban and industries areas
【单选题】
As to the greenhouse effect, the author ________.___
A. share the same view with the scientist
B. is uncertain of its occurrence
C. rejects it as being ungrounded
D. thinks that it will destroy the world soon
【单选题】
The underlined word "offset" in the second paragraph could be replaced by _________.___
A. slip into
B. make up for
C. set up
D. catch up with
【单选题】
It can be concluded that ____________.___
A. raising the world's temperature only a few degrees would not do much harm to life on earth
B. lowering the world's temperature merely a few degrees would lead major farming areas to disaster
C. almost no temperature variations have occurred over the past decade
D. the world's temperature will remain constant in the years to come
【单选题】
This passage is primarily about __________.___
A. the greenhouse effect
B. the burning of fossil fuels
C. the potential effect of air pollution
D. the likelihood of a new ice age
【单选题】
What is the major function of paragraph 1?___
A. To arouse the reader's concern.
B. To introduce the theme of the whole passage.
C. To summarize the whole passage.
D. To state the primary uses of TV.
【单选题】
Television, as a source of entertainment, is ________.___
A. not very convenient
B. very expensive
C. quite dangerous
D. relatively cheap
【单选题】
Why are some people against TV?___
A. Because TV programs are not interesting.
B. Because TV viewers are totally passive.
C. Because TV prices are very high.
D. Because TV has both advantages and disadvantages.
【单选题】
One of the most obvious advantages of TV is that _________.___
A. it keeps us informed
B. it is very cheap
C. it enables us to have a rest
D. it controls our lives
【单选题】
According to the passage, whether TV is good or not depends on ___________.___
A. its quality
B. people's attitude towards it
C. how we use it
D. when we use it
【单选题】
What regulation was issued by New York State concerning beverage containers?___
A. A fee should be charged on used containers for recycling.
B. Throwaways should be collected by the state for recycling.
C. Consumers had to pay for beverage containers and could get their money back on returning them.
D. Beverage companies should be responsible for collecting and reusing discarded plastic soda bottles.
【单选题】
The returned plastic bottles in New York used to _____________.___
A. be turned into raw materials
B. be separated from other rubbish
C. have a second-life value
D. end up somewhere underground
