相关试题
【单选题】
为提高机车与车辆再缓解充气的—致性，当列车管减压量大或降至零时，通过___使降压风缸空气压力保持在280～340kPa之间，使它与车辆制动机的副风缸在全制动后的压力大致保持—致。
A. 充气阀
B. 一次缓解逆流止回阀
C. 转换盖板
D. 保持阀
【单选题】
JZ-7空气制动机工作风缸和降压风缸内的过充压力是通过___消除的。
A. 中继阀
B. 一次缓解逆流止回阀
C. 转换盖板
D. 充气阀
【单选题】
机车膨胀水箱处在内燃机车冷却水系统的___。
【单选题】
JZ-7型空气制动机紧急限压阀在紧急制动时限制作用风缸压力不超过___。
A. 400kPa
B. 450kPa
C. 500kPa
【单选题】
JZ-7型空气制动机的管路系统中设有___个变向阀。
【单选题】
机车在无动力回送时，无动力回送装置能使总风缸空气压力增至___kPa。
A. 360-460
B. 500或600
C. 750-800
【单选题】
无级调速机车，主手柄置“降”位，降速时间为___s。
A. 10—12
B. 10—16
C. 12-22
【单选题】
电气动作试验时控制风缸压力在400kPa以下时，将1-6GK；置于___位。
【单选题】
当制动电流达到___A时，ZLJ动作。
【判断题】
东风4B型内燃机车膨胀水箱冷却水的装载量为1200kg。
【判断题】
运用中，只要机油和冷却水温度超过正常范围，要及时调整温度控制阀，防止机车故障发生。
【判断题】
在燃油精滤器的滤网罩上方的最高处设有集中放油的放油管和放油阀，以便排除管路中的燃油。
【判断题】
柴油一发电机组的弹性支承，可以避免柴油机在高速或低速时发生共振。
【判断题】
盘车机构主要用于盘车检查柴油机运动部件的运动状态。
【判断题】
四冲程柴油机转速为1000r／min时，凸轮轴转速为2000r／min。
【判断题】
在增压器机油进油管上设有保压阀，用以限制进入增压器的机油压力和流量。
【判断题】
柴油机起动循环的油路为：油底壳一起动机油泵一逆止阀一主机油泵出口一机油粗滤器一机油热交换器一柴油机、增压器各润滑处所一油底壳。
【判断题】
柴油机冷却水温过低时，将导致混合气体形成的条件恶化，燃烧不完全，破坏了柴油机的热力状态。
【判断题】
调速器的功调电阻为回转式滑动可变电阻，电阻滑环上共布置73个电阻，总电492．9Ω。
【判断题】
虽然柴油机的紧急停车不会影响柴油机使用寿命，也不宜无故按动紧急停车按钮。
【判断题】
增压器进气道帆布过松，会造成柴油机的增压器喘振。
【判断题】
柴油机负荷时间过长，是造成水温高的原因之一。
【判断题】
柴油机油、水温度低是造成柴油机敲缸的原因之一。
【判断题】
致使机油乳化的原因，主要是机油内含水量较高。
【判断题】
由于喷油器雾化不良，燃油系统有空气，活塞刮油环反装或刮油性能差，均会导致柴油机冒黑烟。
【判断题】
高温水系统水管上的温度控制阀漏油，会造成油水互窜，导致膨胀水箱有油。
【判断题】
当柴油机冷却水温度超过88℃时，水温继电器动作，通过中间继电器2ZJ的作用，柴油机卸载。
【判断题】
柴油机一发电机组的功率输出端通过传动轴与静液压变速箱连接。
【判断题】
回拉手柄时引起柴油机过载的原因是增、减载针阀开度过小。
【判断题】
在正常情况下，联合调节器内的最高转速止钉丢失时，不会造成飞车事故。
【判断题】
主机油泵出口压力为550kPa时，调整阀开启压力为550kPa。
【判断题】
柴油机在空转时转速正常，加载时转速不正常时，多为喷油泵故障或供油齿条卡滞。
【判断题】
柴油机润滑间隙过大或过小，同样会造成轴颈或轴瓦的拉伤。
【判断题】
柴油机放水后再上水时，必须开放有关排气阀。
【判断题】
一个二极管被击穿短路后，1RD将首先熔断，有时出会出现2RD同时熔断现象。
【判断题】
感应子牵引励磁机的感应电动势是由定子上的电枢绕组产生并输出的。
【判断题】
东风4机车启动接触器QC和主发励磁接触器LC，采用CZO-40／20型电磁接触器。
【判断题】
当机车轮对发生空转时，通过空转继电器线圈内的电流达0．1A时，线圈吸合，空转信号灯亮。
【判断题】
空转继电器的构造与接地继电器相同，动作后能自锁。
推荐试题
【判断题】
为了清晰反映构成所有者权益各组成部分当期的增减变动情况，所有者权益变动表采用矩阵形式列示
【判断题】
销售净利率是20%，资产周转率是1次，权益乘数是2，则净资产收益率是40%
【判断题】
一般认为，资本保值率越高，表明企业的资本保全状况越好，所有者权益增长越快，债权人的债务越有保障
【判断题】
如果企业的负债资金的利息率低于其资产报酬率，则提高资产负债率可以增加所有者权益报酬率
【判断题】
杜邦分析体系是利用各主要财务比率之间的内在联系，综合分析企业财务状况的方法。建立财务分析指标体系
【判断题】
沃尔比重评分法是将选定的财务比率用线性关系联系起来，并分别给定各自的分数比重，然后通过与标准比重进行比较，确定各项指标的得分及总体指标的累积分数，从而对企业的信用水平做出评价的方法
【填空题】
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1 In our class,most discussions and activities take place in assigned small groups,These groups provide a supportive and safe environment that （） learning
【填空题】
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9 As the finance ministry rejected the defor its "lack of clarity",it[ ]complaint with the Europear Commission that this deal was against the law
【填空题】
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5 State governments and the colleges themselves have [ ] financial help to students with special abilities and those with financial needs
【填空题】
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10 Dogs cannot distinguish the color of trafficlights, so the master must make the decision of when it is safe to [ ] across the road
【填空题】
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6 The committee agreed that his papers
[ ] a wider circulation because of their essential and fundamental interest to a larger audience.
【填空题】
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1 Because women often restrict their diet
In an effort to control weight,they may
Not consume enough iron-rich food and
( ) experience an iron Deficiency.
【填空题】
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8 Americans defend the right to obtain a gun and they have[ ] been willing to turn a blind eye to the harm that people owning guns have caused
【填空题】
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7 The anger and frustration [ ] by the local people who do not understand what is happening to them will be a terrible and dangerous force
【填空题】
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2 Some reform advocates ignore the impact of
Class size on student achievement,and they
are ( ) what they call as a Priority:teacher effectiveness.
【填空题】
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3 Because of easy access to the Internet,the
New breakthrough tq create something
Truly creative ( ) happen anytime now.
【填空题】
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4 Indeed,if teachers want to( ) how far students might get in life, a better measurement than grades might be how hard the students try.
【填空题】
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5 Nature has( ) these animals ( ) a capacity for not showing Fear.
【填空题】
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6 During the weeks of discussion,delegations
from groups who are interested in the
Resolution may call on representatives to
( ) their point of view.
【填空题】
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7 Plato was a superb writer,and his works are
Part of the world’s great literature.Most of
His existing work is ( )Dialogs and letters.
【填空题】
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8 Young people should enter into a broad
Flexible training program,through which
They can learn a lot and be ( ) their future careers.
【填空题】
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9 The young man is very happy and proud to
be ( ) the old professor because he always feeIs great when talking With him.
【填空题】
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10 One day they passed more than 20 villages ( ),and some of these are Said to have stretched for six miles or more.
【填空题】
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7 Being asingle parent,there is no way for her
to ( ) the time and energy she has
devoted to her children for the past 10 years.
【填空题】
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8 It is essential that you start by listening because one of the main ( ) teenagers and their parents face in forming positive relationships is that neither listens to the other.
【填空题】
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9 We all know the dangers of an earthquake: the ( ) to buildings,the troubles can be caused by falling trees,and the terror occurs when the earth actually opens uip.
【填空题】
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10 Not until recently have we realized that the increasing world population may lead to a potential gloomy ( ) for humanity starvation.
【填空题】
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2 It is the development strategy/of the company to ( ) its overseas expansion in order to take a slice of the world market
【填空题】
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3 Nearly six million people go to see the Mona
Lisa every year,attracted by the ( )of her smile.When you're not lodking at her, she seems to be smiling;when you look at her,she stops.
【填空题】
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4 To live with a family whose native language is English is the ideal way to further improve one's English and to gain ( )into its culture.
【填空题】
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5 There is a real need to ( ) academic
achievement in schools and help with the
development of a student's overall character.
【填空题】
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6 Einstein said his scientific discoveries grew
from his imagination rather than from( ),
reason and language.
【填空题】
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1 When the police caught up with him, Mr.Foster had to [ ] that he'd broken the speed limit.
【填空题】
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2 Whenever my boss makes a decision that I don't agree with, I tell him what I really think, though it's [ ] to make him happy by telling him his ideas are always right
【填空题】
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3 As can be probably perceived, a manned tip to Mars may soon[ ] since scientists have achieved the manned moon mlssion
【填空题】
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4 A number of countries are [ ]their efforts to send out food to the area worst affected by the flood.
【填空题】
immune to , fall in love with , go along with, on one's behalf, be filled with , take the liberty of , expel from , be pessimistic about
She authorizcd her partner to carry out daily responsibllitles [ ]when she was on her business trip
