【单选题】
当线岔处两支均为工作支时，在两接触线相距500mm处正线线岔的侧线接触线比正线接触线高的安全值为___。
A. 0～30mm
B. 10～30mm
C. 0～20mm
D. 10～20mm
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相关试题
【单选题】
当线岔处两支均为工作支时，在两接触线相距500mm处侧线线岔两接触线的高差的安全值不大于___。
A. 20mm
B. 30mm
C. 50mm
D. 80mm
【单选题】
当线岔处一支为非工作支时，160km/h及以下区段的非工作支接触线比工作支接触线抬高的安全值为___。
A. 50～80mm
B. 50～100mm
C. 50～120mm
D. 80～100mm
【单选题】
当线岔处一支为非工作支时，160km/h以上区段延长一跨并抬高后下锚的安全值为___。
A. 300～500mm
B. 350～500mm
C. 400～500mm
D. 450～500mm
【单选题】
当线岔处两支均为工作支时，在两接触线相距500mm处正线线岔侧线接触线比正线接触线高的限界值为___。
A. 0～30mm
B. 10～30mm
C. 0～20mm
D. 10～20mm
【单选题】
当线岔处两支均为工作支时，在两接触线相距500mm处侧线线岔两接触线高差的限界值不大于___。
A. 20mm
B. 30mm
C. 50mm
D. 80mm
【单选题】
当线岔处一支为非工作支时，160km/h及以下区段的非工作支接触线比工作支接触线抬高的限界值为___。
A. 50～80mm
B. 50～100mm
C. 50～120mm
D. 80～100mm
【单选题】
当线岔处一支为非工作支时，160km/h以上区段延长一跨并抬高后下锚的限界值为___。
A. 300～500mm
B. 350～500mm
C. 400～500mm
D. 450～500mm
【单选题】
160km/h及以下区段的线岔两工作支中任一工作支的垂直投影距另一股道线路中心___的范围内始触区范围。
A. 500～800mm
B. 550～800mm
C. 500～850mm
D. 550～850mm
【单选题】
160km/h以上区段，对于宽1950mm的受电弓，在距离受电弓中心___的平面和受电弓仿真最大动态抬升高度（最大200mm）构成的立体空间区域为始触区范围。
A. 500～1050mm
B. 550～1050mm
C. 600～1050mm
D. 700～1050mm
【单选题】
在采用钢铝接触线的区段，电连接采用___多股铝绞线。
A. LJ95
B. LJ120
C. LJ150
D. LJ185
【单选题】
在载流承力索区段每隔___安装一组电连接，将承力索和接触线连接起来，保证可靠供电。
A. 150～200m
B. 200～250m
C. 250～300m
D. 300～350m
【单选题】
绝缘锚段关节处的隔离开关电连接，安装在绝缘锚段关节转换柱的两侧，其中心柱侧距转换柱___。
A. 5m
B. 8m
C. 10m
D. 12m
【单选题】
接触线与电连接线夹接触面，均用细钢丝刷清除表面氧化膜，并用汽油清洗，清洗长度不应少于连接长度的___。
A. 1倍
B. 1.2倍
C. 1.3倍
D. 1.5倍
【单选题】
电连接线应做成弹簧形状，圆圈的间距宜为___。
A. 20mm
B. 30mm
C. 50mm
D. 80mm
【单选题】
电连接线最下方的圆圈距接触线应为___。
A. 200～250mm
B. 200～300mm
C. 250～300mm
D. 250～350mm
【单选题】
在接触网带电的情况下进行电力线路检修时，工作人员的活动范围与接触网之间的安全距离不小于___。
A. 0.6m
B. 0.8m
C. 1.0m
D. 1.2m
【单选题】
在直流电路中，把电流流出的端叫电源的___。
A. 正极
B. 负荷
C. 端电压
D. 正电势
【单选题】
金属导体的电阻与___无关。
A. 导体长度
B. 导体截面积
C. 外加电压
D. 外加温度
【单选题】
160km/h及以下区段定位器坡度的限界值为___。
A. 1/10～1/3
B. 1/10～1/5
C. 1/8～1/3
D. 1/8～1/5
【单选题】
160～200km/h区段定位器坡度的限界值为___。
A. 1/10～1/3
B. 1/10～1/5
C. 1/8～1/3
D. 1/8～1/5
【单选题】
160km/h以上区段，吊弦间距安全值不大于___。
A. 8m
B. 10m
C. 12m
D. 15m
【单选题】
在160km/h及以下运行区段，最短吊弦长度为___。
A. 250mm
B. 300mm
C. 350mm
D. 500mm
【单选题】
在160km/h以上运行区段，一般情况下最短吊弦长度不小于___。
A. 250mm
B. 300mm
C. 350mm
D. 500mm
【单选题】
在160km/h以上运行区段，困难条件下最短吊弦长度不小于___。
A. 250mm
B. 300mm
C. 350mm
D. 500mm
【单选题】
腕臂的安装位置应满足承力索悬挂点距轨面的距离，其允许误差___。
A. ±100mm
B. ±150mm
C. ±200mm
D. ±250mm
【单选题】
腕臂不得弯曲且无永久性变形，顶部非受力部分长度为___。
A. 50～150mm
B. 100～200mm
C. 150～250mm
D. 200～300mm
【单选题】
双线路腕臂应保持水平状态，其允许仰高不得超过___。
A. 50mm
B. 80mm
C. 100mm
D. 120mm
【单选题】
拉杆应呈水平状态，允许悬挂点侧仰高不超过___。
A. 50mm
B. 80mm
C. 100mm
D. 120mm
【单选题】
压管应呈水平状态，允许悬挂点侧仰高不超过___。
A. 50mm
B. 80mm
C. 100mm
D. 120mm
【单选题】
当耐张段长度在800m及以下时，一个耐张段内保护线补强线段的总数量限界值为___。
【单选题】
当耐张段长度在800m及以下时，一个耐张段内回流线接头的总数量限界值为___。
【单选题】
当耐张段长度在800m及以下时，一个耐张段内回流线断股的总数量限界值为___。
【单选题】
当耐张段长度在800m及以下时，一个耐张段内回流线补强线段的总数量限界值为___。
【单选题】
当耐张段长度在800m及以下时，一个耐张段内架空地线接头的总数量限界值为___。
【单选题】
当耐张段长度在800m及以下时，一个耐张段内架空地线断股的总数量限界值为___。
【单选题】
当耐张段长度在800m及以下时，一个耐张段内架空地线补强线段的总数量标限界为___。
【单选题】
一个跨距内一根供电线的接头不得超过___。
A. 1个
B. 2个
C. 3个
D. 根据跨距长度而定
【单选题】
一个跨距内一根加强线的接头不得超过___。
A. 1个
B. 2个
C. 3个
D. 根据跨距长度而定
【单选题】
一个跨距内一根正馈线的接头不得超过___。
A. 1个
B. 2个
C. 3个
D. 根据跨距长度而定
【单选题】
一个跨距内一根回流线的接头不得超过___。
A. 1个
B. 2个
C. 3个
D. 根据跨距长度而定
推荐试题
【单选题】
The president’s visit and ___ discussions led to a plan that aimed to improve the trade relations between the two countries.
A. emerging
B. subsequent
C. consequent
D. Submerging
【单选题】
The author ___ his general idea mainly through statistics and results obtained from a survey (调查) about auto customer services in the United States.
A. assumes
B. engages
C. illustrates
D. represents
【单选题】
People in this town starved, several buildings were bombed and crime ___ because you had to steal to eat.
A. eroded
B. reflected
C. released
D. soared
【单选题】
Olympic recognition for bodybuilding (健美) remains ___ since some argue that bodybuilding is not a sport because the actual contest does not involve the same sort of efforts as “real” sports.
A. controversial
B. conventional
C. characteristic
D. influential
【单选题】
Tom tried to justify his absence from the meeting by ___ that he had been ill that day.
A. admitting
B. advocating
C. claiming
D. citing
【单选题】
___ the huge financial benefits, biological companies have been rushing to set up laboratories and new research projects.
A. Aware
B. Aware of
C. Not aware
D. Not aware of
【单选题】
Unfortunately, ___ lack of funds, the studies he began just two months ago, had to be ended early.
A. out of
B. in addition to
C. owing to
D. to begin with
【单选题】
With a good command of English, he soon got ___ to working with British people.
A. accustomed
B. consistent
C. relevant
D. responsible
【单选题】
What needs to be ___ here is that language and culture interact, and that understanding of one requires understanding of the other.
A. altered
B. stressed
C. aroused
D. committed
【单选题】
Policies and organizations must be created to meet workers’ hopes, and to ___ new problems that inevitably arise between workers and managers.
A. compromise
B. ensure
C. undermine
D. resolve
【单选题】
To keep the wheels of industry turning, we produce consumer goods in endless quantities, and, in the process, are rapidly ___ our natural resources.
A. ignoring
B. collapsing
C. enduring
D. exhausting
【单选题】
As a person who loves peace, he is committed ___ realizing peace between countries.
A. of
B. about
C. for
D. to
【单选题】
Learning how to use chopsticks is easy for me, ___ learning how to conduct myself at the table is quite difficult.
A. whereas
B. however
C. therefore
D. besides
【单选题】
___ that the patient smokes 50 cigarettes a day, it would be reasonable to assume there is some lung damage.
A. To give
B. Giving
C. Given
D. Having given
【单选题】
Kenyan (肯尼亚的) women tend to vote for those who could provide them ___ the necessary food to live on.
A. of
B. with
C. for
D. about
【单选题】
___ all obstacles and failures, the scientist continued doing his experiments day and night.
A. In spite of
B. In contrast to
C. As a matter of
D. As a result of
【单选题】
I’m willing to ___ that a larger car would have cost more, but I still think we should have bought one.
A. withdraw
B. indicate
C. abandon
D. concede
【单选题】
Manufacturing (制造) companies spend millions of pounds on advertisements, trying to ___ customers that their products are better than those of other companies.
A. confine
B. convince
C. depress
D. reconcile
【单选题】
He is not the right person for the project: he is not very technically minded and ___, he does not have the sense of responsibility.
A. instead
B. yet
C. furthermore
D. nevertheless
【单选题】
Death rates declined in many places, partly because of the ___ in hunger.
A. decrease
B. myth
C. obstacle
D. burden
【单选题】
In deciding whether or not a situation is safe, pilots must be taught to assume that the worst will happen, and then to ___ whether there is a risk or not.
A. absorb
B. apply
C. assess
D. occupy
【单选题】
The worker was not worried as he knew that if he gave up the job, there would be ___ opportunities for him to work somewhere else.
A. formative
B. marginal
C. vigorous
D. numerous
【单选题】
The research shows the region might ___ overheating (经济过热), but the policymakers so far appear to be relatively relaxed about the future of the economy.
A. catch a glimpse of
B. be at risk of
C. take a toll on
D. be free from
【单选题】
Measures have been taken to ensure that no student will have to ___ of college for economic reasons.
A. lay out
B. cancel out
C. drop out
D. stand out
【单选题】
Stress that is not treated can lead to significant medical illnesses, which ___ can lead to greater stress and even depression (抑郁症).
A. after all
B. in turn
C. on the contrary
D. at least
【单选题】
Narcissism (自恋) has its benefits in terms of self-belief and confidence, but it also tends to be ___ risky decision-making.
A. associated with
B. contrasted with
C. reserved for
D. relieved of
【单选题】
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.
A. count on
B. cut back on
C. hold on to
D. contribute to
【单选题】
You shouldn’t ___ – let your children make their own decisions.
A. interact
B. abuse
C. startle
D. interfere
【单选题】
This is a huge and difficult project and if you take it up, you ___ many difficulties.
A. like to encounter
B. like encountering
C. are likely to encounter
D. are like to encounter
【单选题】
The ability to live for a long time without water is characteristic ___ the camel.
A. of
B. for
C. about
D. in
【单选题】
Rising sales is a good ___ that this product is well received in the market.
A. response
B. convention
C. indication
D. Influence
【单选题】
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
B. given chase
C. wrapped up
D. ripped off
【单选题】
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
【单选题】
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
【单选题】
We have to be very patient with this experiment. It will take time for some effects to ___ clearly.
A. build up
B. break up
C. clear up
D. show up
【单选题】
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
