【单选题】
长轨条的焊缝部位工作边用直尺测量，矢度不得大于___。
A. 0.3mm
B. 0.5mm
C. 1mm
D. 2mm
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相关试题
【单选题】
车站必须设在曲线时，半径应不小于___。
A. 500m
B. 600m
C. 800m
D. 1000m
【单选题】
线路综合维修周期依据___确定。
A. 通过总重
B. 年通过总重
C. 机车轴重
D. 车辆轴重
【单选题】
调高垫板应垫在大胶垫之间，一般情况下，每处调高垫板总厚度不超过___。
A. 8mm
B. 10mm
C. 15mm
D. 20mm
【单选题】
下列___不是DTⅥ2－1型扣件调整轨距垫
A. 6号
B. 10号
C. 12号
D. 2号
【单选题】
查照间隔及护背距离在心轨轨头宽___mm断面丈量。
A. 20～30
B. 10～30
C. 20～40
D. 30～50
【单选题】
4号线一期工程道岔框架尺寸为___mm。
A. 1508
B. 1516
C. 1506
D. 1510
【单选题】
___不属于产生曲线钢轨不均匀磨耗的主要原因。
A. 曲线超高设置不当
B. 轨底坡不正确
C. 曲线方向不圆顺
D. 钢轨缺乏涂油措施
【单选题】
尖轨按断面形式分类中不含___尖轨。
A. 普通断面钢轨
B. 高型特种断面钢轨
C. 矮型特种断面钢轨
D. 直线型和曲线型
【单选题】
关于尖轨与基本轨不密贴原因的叙述，___是不确切的。
A. 尖轨顶铁过长，补强板螺栓凸出
B. 曲基本轨弯折点位置不对，造成转折器部分轨向不良
C. 基本轨或尖轨本事硬弯
D. 基本轨、轨撑、滑床板挡肩之间存在“三道缝”
【单选题】
关于尖轨跳动产生原因的叙述，___是不确切的。
A. 尖轨跟端轨缝过大，间隔铁和夹板磨耗，螺栓松动，过车时加大了冲击
B. 尖轨拱腰及跟桥型垫板或凸台压溃
C. 捣固不实，有吊板
D. 尖轨与基本轨不密贴或假密贴
【单选题】
关于预防整治尖轨跳动措施的叙述，___是不确切的。
A. 焊补或更换间隔铁、夹板，更换磨耗的双头螺栓
B. 调直拱腰的尖轨，增补整修跟桥型垫板和防跳卡铁
C. 尖轨顶铁过短
D. 加强转辙部分枕下的捣固，尤其是加强接头及尖轨跟端的捣固
【单选题】
关于导曲线轨距扩大的原因叙述，___是不正确的。
A. 列车与钢轨之间摩擦力
B. 列车横向推力
C. 车轮冲击钢轨
D. 列车离心力
【单选题】
关于导曲线外股钢轨侧面磨耗产生的原因叙述，___是不正确的。
A. 曲线外股没有设置 超高
B. 长期受离心力作用
C. 导曲线存在反超高
D. 导曲线轨距超限
【单选题】
关于辙叉轨距不合标准产生的原因叙述，___是不确切的。
A. 拨正直股方向
B. 查照间隔和护背距离不合标准
C. 护轨轮缘槽尺寸不合标准
D. 辙叉轮缘槽尺寸不合标准
【单选题】
无缝线路地段安排全年维修计划时，一般不考虑___。
A. 季节特点
B. 锁定轨温
C. 线路状态
D. 轨道类型
【单选题】
在线路上焊接钢轨时，气温不应低于___℃。
【单选题】
当断缝小于50mm时，应立即进行紧急处理。在断缝处上好夹板或臌包夹板，用急救器固定，在断缝前后各50m拧紧扣件，并派人看守，限速放行列车速度为___。
A. 5-10km/h
B. 15-25km/h
C. 1-5km/h
D. 10-15km/h
【单选题】
钢轨铝热焊焊缝接头应平整圆顺，用1m直尺测量，顶面、侧面不平度应在___以内，顶面不得有负值。
A. 0.5mm
B. 1mm
C. 1.5mm
D. 2mm
【单选题】
氧气瓶、丙烷瓶在焊接和切割火焰的上风方向和侧风方向，禁止布置在火焰的___方向的。
【单选题】
丙烷瓶与明火的距离不得小于___。
A. 3m
B. 5m
C. 10m
D. 15m
【单选题】
丙烷瓶与氧气瓶的距离不得小于___。
A. 3m
B. 5m
C. 10m
D. 15m
【单选题】
在钢轨焊接中，含碳量高的钢轨比含碳量低的可焊性___。
【单选题】
70°探头探测轨头时只有二次波显示位移量较大应___。
A. 判轻伤
B. 判重伤
C. 不判伤
D. 进行校正后确认
【单选题】
超声波的波长___。
A. 与速度和频率成正比
B. 与速度成正比与频率成反比
C. 与速度成反比与频率成正比
D. 等于速度和频率的乘积
【单选题】
超声波到达两个不同材料的界面上，可能发生___。
A. 反射
B. 折射
C. 波形转换
D. 反射、折射和波形转换
【单选题】
被放大的信号幅度与缺陷的反射面积成正比地增大，放大器这一非饱和的放大区域称为___。
A. 灵敏度范围
B. 线性范围
C. 选择范围
D. 分辨率范围
【单选题】
超声波探伤仪中，产生时间基线的部分叫做___。
A. 扫描电路
B. 接收器
C. 脉冲器
D. 同步器
【单选题】
探测厚焊缝中垂直于表面的缺陷最适用的方法是___。
A. 聚焦探头
B. 直探头
C. 斜探头
D. 串列斜探头
【单选题】
钢轨焊缝中的各种缺陷最不容易检测的缺陷有___。
A. 光斑
B. 灰斑
C. 光斑和灰斑
D. 气孔
【单选题】
探头发射脉冲声波的___是表示探头频率特性的最合理的数据。
【单选题】
钢轨核伤的是由哪种原因发展形成的___。
A. 气泡
B. 夹渣
C. 外部冲击伤痕
D. 以上都是
【单选题】
同种材料中，在给定频率下产生波长短的波动形式是___。
A. 纵波
B. 压缩波
C. 横波
D. 表面波
【单选题】
因表面粗糙使超声波束产生的漫射叫做___。
A. 角度调整
B. 散射
C. 折射
D. 扩散
【单选题】
材料的声速与密度的乘积，可决定超声波在界面上的声能反射率与透过率，这一乘积称为___。
A. 声阻抗
B. 声速
C. 波长
D. 相位区
【单选题】
一定频率的超声波通过声速低的材料时，其波长将比通过声速高的材料时___。
A. 一样
B. 增长
C. 减短
D. 成倍增长
【单选题】
缺陷的当量尺寸总是___缺陷的实际尺寸。
A. 小于
B. 等于
C. 大于
D. 小于或等于
【多选题】
轨距是左右两股钢轨内侧顶面以下___处的距离。
A. 16mm
B. 15mm
C. 14mm
D. 13mm
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Narcissism (自恋) has its benefits in terms of self-belief and confidence, but it also tends to be ___ risky decision-making.
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When Tom saw his doctor again, she suggested that maybe a more substantial lunch, like a sandwich, might ___ his desire to have snacks in the afternoon.
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You shouldn’t ___ – let your children make their own decisions.
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This is a huge and difficult project and if you take it up, you ___ many difficulties.
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The ability to live for a long time without water is characteristic ___ the camel.
A. of
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Rising sales is a good ___ that this product is well received in the market.
A. response
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D. Influence
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When tourists travel abroad, they are sometimes ___ by the local people because the tourists don’t know the real value of products.
A. turned in
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C. wrapped up
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The professor’s lecture ___ the capacity of his young audience. They all looked puzzled at him.
A. pointed out
B. went beyond
C. contributed to
D. kept off
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We must ___ on the amount of time we use on this project.
A. cut both ways
B. cut in line
C. cut off
D. cut down
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We have to be very patient with this experiment. It will take time for some effects to ___ clearly.
A. build up
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Perhaps there is a(n) ___ of truth in both theories, but few of us would ever have the opportunity to find out.
A. lump
B. substance
C. section
D. element
【单选题】
Be careful when you get along with her because she is known for her short ___.
A. temper
B. emotion
C. mood
D. feeling
【单选题】
It seems that wearing less formal clothing to school and work is becoming a(n) ___.
A. trend
B. campaign
C. goal
D. occurrence
【单选题】
You cannot correct children’s bad behavior simply with a (n) ___ or two on the hand or face.
A. slap
B. smash
C. slam
D. strike
【单选题】
Our investigations (调查) ___ something very surprising – many of the employees are underpaid and work overtime all the time.
A. reveal
B. bump
C. rip
D. frustrate
【单选题】
She was James’s faithful assistant, in whom he could have ___ confidence.
A. essential
B. automatic
C. ultimate
D. absolute
【单选题】
If you visit this website, you can ___ the categories to find information about all the universities in that area.
A. observe
B. browse
C. glance
D. look
【单选题】
Making New Year’s resolutions (计划) is a custom that still ___ in this country.
A. prevails
B. attaches
C. descends
D. launches
【单选题】
The military officers were more ___ about their own victory and therefore more willing to predict their enemy’s defeat.
A. appropriate
B. ignorant
C. negative
D. optimistic
【单选题】
___ is no doubt that overwork and much worry caused his illness.
A. It
B. There
C. Here
D. This
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___ a day goes by that I don’t receive dozens of junk mails in my email box.
A. None
B. Usually
C. Nearly
D. Hardly
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Please trust me. Try this new method ___.
A. you feel very relaxed
B. and you feel very relaxed
C. you will feel very relaxed
D. and you will feel very relaxed
【单选题】
John said Mom was coming back tomorrow, not next week. If this is the ___, we’ll all have to clean the house thoroughly.
A. point
B. norm
C. question
D. case
【单选题】
It is far too late for you to go out and play football, ___ the fact that it’s raining.
A. no doubt
B. despite
C. given
D. not to mention
【单选题】
However, under no circumstances should we ___ our achievements, nor should we regard our accomplishments as unimportant.
A. present
B. perceive
C. exemplify
D. exaggerate
【单选题】
Jane picked up a magazine from the bookshelf and started reading here and there ___.
A. accurately
B. randomly
C. emotionally
D. continually
【单选题】
In many Middle Eastern cultures a deadline is taken as a(n) ___, and such terms should not appear in a purchase contract with businessmen from these countries.
A. target
B. favor
C. honor
D. insult
【单选题】
He is by no means a(n) ___ man. On the contrary, he always departs from customs.
A. disgraceful
B. sophisticated
C. traditional
D. intelligent
【单选题】
Although the nuclear radiation problems remain unsolved, the government’s emphasis has been ___ from coal to nuclear.
A. intended
B. defined
C. attached
D. switched
【单选题】
The psychologist doesn’t say directly, but seems to ___ that emotional maturity and self-stimulation are the key elements for success.
A. inquire
B. imply
C. refer
D. confront
【单选题】
The top floors of a building collapsed, trapping a construction worker in the rubble (瓦砾), but he was ___ and could talk to rescuers.
A. reasonable
B. rational
C. innocent
D. conscious
【单选题】
After ___ research by the local government, officials confidently stated that this area of the sea was much safer than before.
A. extensive
B. durable
C. partial
D. extreme
【单选题】
As the world is becoming global, it is increasingly important that countries work together to ___ international trade.
A. soar
B. rise
C. facilitate
D. prompt
【单选题】
As the technology develops, it is probable that electronic books will start to ___ paper books in the near future.
A. ban
B. exchange
C. employ
D. replace
【单选题】
The man was sentenced to 10 years in prison after he was accused of ___ a senior bank official.
A. bribing
B. frustrating
C. chasing
D. eliminating
【单选题】
Youngsters who drink and smoke, and are often absent from school are far more likely to be ___ from school.
A. forbidden
B. induced
C. expelled
D. disobeyed
【单选题】
大学生适应新的学习、生活环境，很重要的一点就是___。
A. 勇于尝试，不怕失败
B. 培养优良学风
C. 培养和提高独立生活能力
D. 培养自信心。
【单选题】
创新学习是一种以___为基础，采取创造性方法，积极追求创造性成果的学习。
A. 奇思异想
B. 瞬间顿悟
C. 求真务实
D. 求新求变
【单选题】
“知之为知之，不知为不知，是知也。”这句话告诉我们，在学习上一定要培养___的优良学风。
A. 求实
B. 一丝不苟
C. 勤奋
D. 敢为人先
【单选题】
“业精于勤荒于嬉；行成于思毁于随”，这句话说明了学习必须做到___
