【单选题】
动力制动力的大小受到机车动力___功率的限制。P104T439
查看试卷,进入试卷练习
微信扫一扫,开始刷题
相关试题
【单选题】
电磁制动应用在高速列车上,属于___。P104T439
【单选题】
造成滑行的原因之一是轨面有水、霜、冰、雪、油脂等物,降低了___。P106T445
【单选题】
造成滑行的原因之一是闸瓦压力过高,使制动力大于___。P106T445
A. 摩擦力
B. 粘着牵引力
C. 轮轨间的粘着力
【单选题】
列车紧急制动时,除机车制动机的自动撒砂外,当列车速度___时,应少量撒砂。P106T447
【单选题】
列车操纵示意图应根据担当区段的使用机型、___以及线路纵断面情况,按安全、合理的操纵方法绘制。P107T451
【单选题】
闸瓦产生的制动力等于闸瓦与车轮踏面之间的___。P109T459
【单选题】
有效制动时间内(到停车或缓解为止)列车所走行的距离称为___。P109T460
A. 列车制动距离
B. 有效制动距离
C. 空走距离
【单选题】
在列车施行常用制动后,若制动管再继续减压,制动缸的压力也不会再上升,这个使双方压力均衡时的制动管减压量,称为___。P109T462
A. 最大有效减压量
B. 最小减压量
C. 追加减压量
【单选题】
列车制动管定压为600kPa时,最大有效减压量为___。P109T462
A. 140kPa
B. 150kPa
C. 170kPa
【单选题】
发生滑行时轮轨间粘着状态被破坏,使列车制动力下降,延长了___。P110T467
【单选题】
掌握空转发生的规律,进入长大上坡道前,应尽可能___列车运行速度,充分利用动能闯坡。防止因发生空转而造成坡停。 P111T468
【单选题】
为防止空转,通过道岔群时提手柄不要过急过快 ,遇有空转预兆时立即___。P111T468
【单选题】
机车速度变化影响粘着系数,机车速度增高,粘着系数___。P111T470
【单选题】
制动空走时间与___无关。P112T471
A. 机车牵引的车辆数
B. 制动管减压量
C. 列车速度
【单选题】
以下不是机车、车辆的基本阻力的为___。112T476
A. 坡道阻力
B. 轴承的摩擦
C. 车轮与钢轨间的滚动摩擦。
【单选题】
以下是机车、车辆的基本阻力的为___。112T476
【单选题】
列车高速运行时,基本阻力主要是___。P112T476
【单选题】
加装了切控阀的客运机车,制动缸压力与制动管减压量的关系为___。P113T480
A. 1:1
B. 1:2.5
C. 1:3.25
【单选题】
压缩车钩时要注意被压缩的车辆数不应超过列车总量数的___。P114T484
【单选题】
列车施行常用制动在进入停车线停车时,应做到___,并不应使用单阀制动停车。P115T486
【单选题】
列车常用制动时,应遵守初次减压量不得少于___。P115T486
A. 50kPa
B. 60kPa
C. 70kPa
【单选题】
追加减压量一般不应超过两次;___追加减压量不得超过初次减压量;累计减压量不应超过最大有效减压量。P115T486
【单选题】
货物列车运行中,自阀减压排风未止,不得缓解机车制动;自阀减压后至缓解、停车前,机车制动缸压力不得少于___。P115T486
A. 50kPa
B. 60kPa
C. 70kPa
【单选题】
使用动车制动时,制动电流不得超过___。P116T487
【单选题】
动力制动与空气制动配合使用时,应将机车制动缸压力及时缓解为___(设有自动控制装置的机车除外)。P116T487
【单选题】
列车在运行中,司机应按照“___”操纵列车,按规定使用列车运行监控记录装置、无线调度电话、机车自动信号以及机车自动停车装置,并严格执行呼唤应答和车机联控制度。P117T493
A. 列车操纵示意图
B. 列车运行图
C. 机车周转图
【单选题】
货物列车在开车后、进站前,应使用列尾装置对___的压力变化情况进行检查。P117T493
【单选题】
在通风不良,比较潮湿的隧道内爬坡牵引运行时,要适量撒砂,防止机车___。P119T497
【单选题】
列车在接近隧道前,在允许范围内尽量___列车速度。P119T497
【单选题】
列车施行制动后不再进行缓解,根据列车减速情况进行追加减压,即可使列车停于预定地点,叫作___。P119T498
A. 一段制动法
B. 二段制动法
C. 牵引辅助法
【单选题】
防止列车断钩,坡道起动时,视情况可采用___的方法,随着列车缓解再逐步加大起动电流。P121T506
A. 先缓解制动后加载
B. 先加载后缓解制动
C. 直接起动
【单选题】
防止列车断钩,进站停车施行空气制动要适当加长制动距离,初次减压量要小,做到___。P121T506
A. “早减压、少减压”
B. 晚减压、大减压
C. 晚减压、少减压
【单选题】
以压力空气作为动力来源,但___用电来控制制动装置的制动、保压和缓解作用。P126T521
A. 空气制动机
B. 电空制动机
C. 真空制动机
【单选题】
使用带有闸片的制动钳夹紧安装在车轮两侧或车轴上的制动盘,使其发生摩擦阻力而产生制动作用称为___。P127T522
A. 闸瓦制动
B. 盘形制动
C. 轨道电磁制动
【单选题】
制动盘装在车轮上的叫___盘形制动基础制动装置。P130T532,
【单选题】
截断塞门安装在车辆制动___上。P131T536
【单选题】
凡遇列车中某一车辆制动机发生故障,不能及时修复或因车辆装载的货物规定需停止使用该车制动机等情况时,可以关闭___,同时拉动缓解阀。P131T536
【单选题】
一辆车的___,就是在制动管一定的减压速度下经过一定的时间或一定的减压量,制动机必须发生制动作用。P140T549
【单选题】
制动管经排气口向大气排气时,制动管中的压力降将沿着列车长度___逐次传播,就是空气波。P140T550
A. 由后向前
B. 由中间到两端
C. 由前向后
【单选题】
LKJ-2000监控装置采用___工作方式。P170T694
推荐试题
【单选题】
The tests themselves are by no means free from error..." (Line 1-2.Para.3) means ____________. ___
A. the tests definitely have no error
B. the tests sometimes make mistakes
C. the polygraphers do not make mistakes
D. the polygraphers can avoid error by using some techniques
【单选题】
Which of the following is true? ________________ ___
A. The tests are conducted by qualified polygraphers.
B. Innocent people may blush or stammer when questioned.
C. Guilty people can definitely be found out by answer questions
D. Guilty people may escape by refusing to answer questions.
【单选题】
What troubles lie detector researchers most is that _______________. ___
A. innocent people are convicted crimes
B. innocent people will learn to tell lies
C. lie detectors may cause industrial unrests
D. lie detectors are sometimes not dependable
【单选题】
In the passage the author's attitude towards "mixed-ability teaching" is _______. ___
A. critical
B. questioning
C. approving
D. objective
【单选题】
By "held back" (Line 1) the author means _____. ___
A. made to remain in the same classes
B. forced to study in the lower classes
C. drawn to their studies
D. prevented from advancing
【单选题】
The author argues that a teacher's chief concern should be the development of the student's _________. ___
A. personal qualities and social skills
B. total personality
C. learning ability and communicative skills
D. intellectual ability
【单选题】
Which of the following is NOT MENTIONED in the third paragraph? __________ ___
A. Group work gives pupils the opportunity to learn to work together with others.
B. Pupils also learn to develop their reasoning abilities.
C. Group work provides pupils with the opportunity to learn to be capable organizers.
D. Pupils also learn how to participate in teaching activities.
【单选题】
The author's purpose in writing this passage is to ______. ___
A. argue for teaching bright and not-so-bright pupils in the same class
B. recommend pair work and group work for classroom activities
C. offer advice on the proper use of the library
D. emphasize the importance of appropriate formal classroom teaching
【单选题】
According to the author, the deaths among youth are mainly caused by _____. ___
A. traffic accidents
B. smoking-related diseases
C. murder
D. all of these
【单选题】
Every day there are over_____high school students who will become regular smoker. ___
A. 75
B. 23
C. 30
D. 3000
【单选题】
By "dropout" the author means______. ___
A. students who failed the examination
B. students who left school
C. students who lost their way
D. students who were driven out of school
【单选题】
The reason for declining adolescent smoking is that ________. ___
A. NCI has taken effective measures
B. smoking is prevented among high school seniors
C. there are many smokers who have died of cancer
D. not stated
【单选题】
What is implied but not stated by the author is that ________. ___
A. smoking rates among youth have declined very little
B. there are now more female than male smokers among high school seniors
C. high smoking rates are due to the increase in wealth
D. smokers at high school are from low socio-economic backgrounds
【单选题】
According to the passage, which of the following is NOT a disadvantage of part time education? _______________ ___
A. It requires some break in one's career.
B. It tends to last too long for many people to complete a degree program.
C. It affects one's career.
D. It gives the student less time to share with the family.
【单选题】
Which of the following is NOT an advantage of distance learning? _________ ___
A. The student may choose his or her own pace.
B. The student may study at any time to his or her convenience.
C. They can pursue their chosen career while studying.
D. Their tutorial assistance comes through regular airmail, telephone, etc.
【单选题】
What benefit will distance learning program bring to a business? __________ ___
A. Recruitment of more talented people.
B. Good image of the business.
C. Better cooperation with universities.
D. Further training of employees and business growth.
【单选题】
Good distance learning program have the following characteristic EXCEPT______. ___
A. distance learning course is the same as students taking courses in campus
B. the degree should be same as on campus study
C. professor-student relationship is strictly one to one all through the course
D. includes subject evaluation tool
【单选题】
What benefit will distance learning bring to an employee of a business? ___________ ___
A. Professional growth.
B. Good relationship with the employer.
C. Good impression on the employer.
D. Higher salary.
【单选题】
In the first paragraph, what does "plastic money" (Line 6, Para.1) refer to? ______ ___
A. Dollars.
B. Online payment.
C. Credit cards.
D. Coins.
【单选题】
Which of the following is NOT true about credit cards? ____________ ___
A. Shopkeepers, among others, object to the use of credit cards because they add on the cost of the merchandise.
B. Credit card holders actually pay for their goods after the purchase has been completed.
C. The national company enjoys extensive growth because of the use of credit cards.
D. It has had the effect of increasing consumption.
【单选题】
What is the disadvantage of credit cards? _____________ ___
A. It may lead to the overgrowth of the national economy.
B. The delay in the payment of shopping goods may bring damage to shopkeepers' profits.
C. Some people may intentionally purchase goods that they cannot possibly afford.
D. Those who pay by cash at the purchase will have to pay for the cost added to the product as the interest charge of credit cards.
【单选题】
What is the main topic of the text? ________________ ___
A. Advantages and Disadvantages of Credit Cards.
B. Economic Growth Backed up by the Use of Credit Cards.
C. It can encourage great sums of consumption.
D. Credit Cards Make Life
E. asier.
【单选题】
The author's attitude towards credit card is.______________. ___
A. agreeable
B. neutral
C. humorous
D. oppositional
【单选题】
不含有割地内容的不平等条约是___。
A. 《南京条约》
B. 《北京条约》
C. 《马关条约》
D. 《辛丑条约》
【单选题】
在甲午战争后,严复翻译的《天演论》所宣传的重要思想是___。
A. “师夷长技以制夷”
B. “中学为体,西学为用”
C. “天下兴亡,匹夫有责”
D. “物竞天择,适者生存”
【单选题】
火烧圆明园发生在___期间。
A. 鸦片战争
B. 第二次鸦片战争
C. 甲午战争
D. 八国联军侵华战争
【单选题】
规定允许外国在中国办工厂的条约是___。
A. 《南京条约》
B. 《北京条约》
C. 《马关条约》
D. 《辛丑条约》
【单选题】
1895 年,日本强迫清政府签订___,割去台湾全岛及所有附属岛屿和澎湖列岛。
A. 《南京条约》
B. 《北京条约》
C. 《马关条约》
D. 《辛丑条约》
【单选题】
近代以来中国反侵略战争失败的最根本原因是___。
A. 帝国主义的强大
B. 社会制度的腐败
C. 经济技术的落后
D. 中国军队军事素质低下
【单选题】
鸦片战争以清政府的失败而告终。1842 年 8 月 29 日,清政府与英国签订了中国近代史上的第一个不平等条约是___。
A. 中英《虎门条约》
B. 中英《南京条约》
C. 中美《望厦条约》
D. 中法《黄埔条约》
【单选题】
在近代中国,规定中国向列强支付赔款最多的条约是___。
A. 《南京条约》
B. 《北京条约》
C. 《马关条约》
D. 《辛丑条约》
【单选题】
到___的订立为止,庞杂的不平等条约体系已宣告中国半殖民地社会的完全形成。
A. 《天津条约》
B. 《北京条约》
C. 《辛丑条约》
D. 《马关条约》
【单选题】
德国元帅瓦德西说:“无论欧、美、日本各国,皆无此脑力与兵力,可以统治此天下生灵四分之一,故瓜分一事,实为下策。”这表明___。
A. 帝国主义已灭亡中国
B. 帝国主义之间相互勾结
C. 帝国主义瓜分中国图谋的破产
D. 帝国主义之间的矛盾
【单选题】
帝国主义列强掀起瓜分中国的狂潮是在___。
A. 中日甲午战争爆发后
B. 第一次鸦片战争爆发后
C. 八国联军战争爆发后
D. 第二次鸦片战争爆发后
【单选题】
下面表述不正确的是___。
A. 中国人民的反侵略战争,激起了帝国主义列强的侵华野心。
B. 中国人民的反侵略战争,使我们的国家和民族历尽劫难、屡遭侵略而不亡。
C. 中国人民的反侵略战争表现出来的爱国主义精神,铸成了中华民族的民族魂。
D. 中国人民反侵略战争的失败,从反面教育了中国人民,极大地促进了中国人的思考、探 索和奋起,反侵略战争的过程,是中华民族逐步觉醒的过程。
【单选题】
列强未能瓜分中国的最根本原因是___。
A. 列强之间的矛盾
B. 国际舆论的谴责
C. 中华民族不屈不饶的反侵略斗争
D. 清政府的妥协
【单选题】
魏源在其___中,提出了“师夷长技以制夷”的思想,主张学习外国先进的军事和科学技术,以期富国强兵,抵御外国侵略,开创了中国近代向西方学习的新风。
A. 《四洲志》
B. 《盛世危言》
C. 《夷情备采》
D. 《海国图志》
【单选题】
近代中国睁眼看世界的第一人是___。
A. 林则徐
B. 李鸿章
C. 郑观应
D. 魏源
【单选题】
造成近代中国贫穷落后的根本原因是___。
A. 中国落后的经济制度
B. 中国落后的政治制度
C. 资本—帝国主义的侵略
D. 统治集团的腐败
【单选题】
在 1895 年,严复就写了《救亡决论》一文,响亮地喊出了___的口号。
A. “振兴中华”
B. 求富
C. “救亡”
D. “中体西用”