【单选题】
When the driver heard that there was a bomb on the bus, he immediately ___ to the side of the highway and radioed the police.
A. put out
B. took off
C. pulled over
D. slipped off
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答案
C
解析
暂无解析
相关试题
【单选题】
She was very ___ to become a manager in our customers’ office, but finally accepted our offer.
A. eager
B. intelligent
C. ridiculous
D. reluctant
【单选题】
In the race, it looked as if he would be the first, but then another young man who was close behind him put on speed and ___ by a few seconds.
A. beat him for it
B. beat him to it
C. beat him up
D. beat it to him
【单选题】
It is really helpful to have someone like you that we can ___ and count on during difficult times.
A. lean on
B. get to
C. hang on
D. get by
【单选题】
Women have a greater ability to ___ names with faces than men do, and they are also better at recalling lists.
A. associate
B. compare
C. engage
D. involve
【单选题】
He was always ready to help others and managed to ___ his friends ____being hurt.
A. expose … to
B. confine …to
C. restrict … from
D. shield … from
【单选题】
Older people are less likely to be ___ their negative emotions (情绪) and more likely to focus on the positive.
A. reserved for
B. caught up in
C. beat up to
D. counted on
【单选题】
I don’t have any bandage, so I have to ___ pressure to the wound to keep the bleeding down.
A. apply
B. involve
C. fulfill
D. establish
【单选题】
It is important that whichever candidate (候选人) is picked the loser should accept the defeat ___.
A. in advance
B. with great pride
C. with good grace
D. in large part
【单选题】
___ that new homes cost more than older homes, but that is not true across the country anymore.
A. It used to be
B. It is used to be
C. It used to being
D. It is used to being
【单选题】
The boss ___ his employees to work longer hours as the company is dreadfully short of staff at present.
A. called on
B. signed up
C. cared for
D. set up
【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
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The ability to live for a long time without water is characteristic ___ the camel.
A. of
B. for
C. about
D. in
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【单选题】
在机组允许的负荷变化范围内,采用___对寿命的损耗最小。
A. 变负荷调峰;
B. 两班制启停调峰;
C. 少汽无负荷调峰;
D. 少汽低负荷调峰。
【单选题】
高压加热器在工况变化时,热应力主要发生在___。
A. 管束上;
B. 壳体上;
C. 管板上;
D. 进汽口。
【单选题】
汽轮机停机后,转子弯曲值增加是由于___造成的。
A. 上下缸温差;
B. 汽缸内有剩余蒸汽;
C. 汽缸疏水不畅;
D. 转子与汽缸温差大。
【单选题】
当汽轮机膨胀受阻时,___。
A. 振幅随转速的增大而增大;
B. 振幅与负荷无关;
C. 振幅随着负荷的增加而减小;
D. 振幅随着负荷的增加而增大。
【单选题】
当汽轮发电机组转轴发生动静摩擦时,___。
A. 振动的相位角是不变的;
B. 振动的相位角是变化的;
C. 振动的相位角有时变有时不变;
D. 振动的相位角起始变化缓慢,以后加剧。
【单选题】
当转轴发生自激振荡时,___。
A. 转轴的转动中心是不变的;
B. 转轴的转动中心围绕几何中心发生涡动;
C. 转轴的转动中心围绕汽缸轴心线发生涡动;
D. 转轴的转动中心围绕转子质心发生涡动。
【单选题】
当转轴发生油膜振荡时,___。
A. 振动频率与转速相一致;
B. 振动频率为转速之半;
C. 振动频率为转速的一倍;
D. 振动频率与转子第一临界转速基本一致。
【单选题】
摩擦自激振动的相位移动方向___。
A. 与摩擦接触力方向平行;
B. 与摩擦接触力方向垂直;
C. 与转动方向相同;
D. 与转动方向相反。
【单选题】
间隙激振引起的自激振荡的主要特点是___。
A. 与电网频率有关;
B. 与电网频率无关;
C. 与机组的负荷无关;
D. 与机组的负荷有关。
【单选题】
汽轮机的负荷摆动值与调速系统的迟缓率___。
A. 成正比;
B. 成反比;
C. 成非线性关系;
D. 无关。
【单选题】
当转子的临界转速低于工作转速___时,才有可能发生油膜振荡现象。
A. 4/5;
B. 3/4;
C. 2/3;
D. 1/2。
【单选题】
滑参数停机时,___作汽轮机超速试验。
A. 可以;
B. 采取安全措施后;
C. 严禁;
D. 领导批准后。
【单选题】
滑参数停机过程与额定参数停机过程相比,___。
A. 容量出现正胀差;
B. 容易出现负胀差;
C. 胀差不会变化;
D. 胀差变化不大。
【单选题】
汽轮机停机惰走降速时,由于鼓风作用和泊桑效应,低压转子会出现___突增。
A. 正胀差;
B. 负胀差;
C. 不会出现;
D. 胀差突变。
【单选题】
机组变压运行,在负荷变动时,要___高温部件温度的变化。
A. 减少;
B. 增加;
C. 不会变化;
D. 剧烈变化。
【单选题】
蒸汽与金属间的传热量越大,金属部件内部引起的温差就___。
A. 越小;
B. 越大;
C. 不变;
D. 少有变化。
【单选题】
汽轮机在稳定工况下运行时,汽缸和转子的热应力___。
A. 趋近于零;
B. 趋近于某一定值;
C. 汽缸大于转子;
D. 转子大于汽缸。
【单选题】
新装机组的轴承振动不宜大于___mm。
A. 0.045;
B. 0.040;
C. 0.035;
D. 0.030。
【单选题】
给水泵在运行中的振幅不允许超过0.05mm,是为了___。
A. 防止振动过大,引起给水压力降低;
B. 防止振动过大,引起基础松动;
C. 防止轴承外壳遭受破坏;
D. 防止泵轴弯曲或轴承油膜破坏造成轴瓦烧毁。
【单选题】
当凝汽器真空度降低,机组负荷不变时,轴向推力___。
A. 增加;
B. 减小;
C. 不变;
D. 不确定。
【单选题】
当___发生故障时,协调控制系统的迫降功能将使机组负荷自动下降到50%MCR或某一设定值。
A. 主设备;
B. 机组辅机;
C. 发电机;
D. 锅炉。
【单选题】
两班制调峰运行方式为保持汽轮机较高的金属温度,应采用___。
A. 滑参数停机方式;
B. 额定参数停机方式;
C. 定温滑压停机方式;
D. 任意方式。
【单选题】
汽轮机发生水冲击时,导致轴向推力急剧增大的原因是___。
A. 蒸汽中携带的大量水分撞击叶轮;
B. 蒸汽中携带的大量水分引起动叶的反动度增大;
C. 蒸汽中携带的大量水分使蒸汽流量增大;
D. 蒸汽中携带的大量水分形成水塞叶片汽道现象。
【单选题】
汽轮发电机的振动水平是用___来表示的。
A. 基础的振动值;
B. 汽缸的振动值;
C. 地对轴承座的振动值;
D. 轴承和轴颈的振动值。
【单选题】
机组频繁启停增加寿命损耗的原因是___。
A. 上下缸温差可能引起动静部分摩擦;
B. 胀差过大;
C. 汽轮机转子交变应力太大;
D. 热应力引起的金属材料疲劳损伤。
【单选题】
国产300、600MW汽轮机参加负荷调节时,机组的热耗表现为___。
A. 纯变压运行比定压运行节流调节高;
B. 三阀全开复合变压运行比纯变压运行高;
C. 定压运行喷嘴调节比定压运行节流调节低;
D. 变压运行最低。
【单选题】
汽轮机变工况运行时,蒸汽温度变化率愈( ),转子的寿命消耗愈___。
A. 大、大;
B. 大、小;
C. 小、大;
D. 寿命损耗与温度变化没有关系。
【单选题】
作真空系统严密性试验时,如果凝汽器真空下降过快或凝汽器真空值低于___MPa,应立即开启抽气器空气泵,停止试验。
A. 0.09;
B. 0.087;
C. 0.084;
D. 0.081。
【单选题】
数字式电液控制系统用作协调控制系统中的___部分。
A. 汽轮机执行器;
B. 锅炉执行器;
C. 发电机执行器;
D. 协调指示执行器。
【单选题】
根据环境保护的有关规定,机房噪声一般不超过___dB。
A. 80~85;
B. 85~90;
C. 90~95;
D. 95~100。
【单选题】
为了防止油系统失火,油系统管道、阀门、接头、法兰等附件承压等级应按耐压试验压力选用,一般为工作压力的___倍。
A. 1.5;
B. 1.8;
C. 2;
D. 2.2。
【单选题】
中间再热机组应该___进行一次高压主汽门、中压主汽门(中压联合汽门)关闭试验。
A. 隔天;
B. 每周;
C. 隔10天;
D. 每两周。
【单选题】
机组启动前,发现任何一台油泵或其自启动装置有故障时,应该___。
A. 边启动边抢修;
B. 切换备用油泵;
C. 报告上级;
D. 禁止启动。
【多选题】
运行中通过监视调节级压力的变化可以判断___
A. 新蒸汽流量的变化,负荷的高低;
B. 通流部分是否存在结垢、损坏及堵塞
C. 汽轮机叶片是否损坏、变形;
D. 主蒸汽压力的变化;
【多选题】
汽轮机通流部分结垢后,可导致___
A. 汽轮机接带负荷的能力下降;
B. 汽轮机的效率降低;
C. 汽轮机级的反动度发生变化;
D. 汽轮机的轴向推力增加;
【多选题】
汽轮机发生过大的振动时存在哪些危害___
A. 损坏机组零件;
B. 动静部分发生摩擦;
C. 造成基础松动或周围建筑物损坏;
D. 造成汽缸变形;
【多选题】
汽轮机运行中发生振动,可能的原因有___
A. 主汽温度过低或轴封带水发生水冲击;
B. 汽缸变形、滑销系统卡涩导致动静部分摩擦;
C. 汽轮机组转子弯曲、中心不正或叶片脱落;
D. 油质恶化有杂物、油压过低或油温过高;
【多选题】
运行中给水温度下降的原因有___
A. 高加换热管结垢、堵管较多或机组负荷下降;
B. 高加换热管发生泄漏;
C. 高加液位过高或水侧流量突然增加;
D. 高加内部隔板泄漏或水侧旁路未关严;
【多选题】
由工业冷却水供给密封水或冷却水的设备有___
A. 给水泵、凝结泵、真空泵冷却水;
B. 润滑油冷油器、EH油冷油器和发电机空冷器;
C. 给水泵、凝结泵密封水;
D. 润滑油油净化装置真空泵;
【多选题】
向辅汽母管供汽的汽源有___
A. 两台机的三段抽汽;
B. 两台辅汽减温减压器;
C. 化工区来启动汽源;
D. 除氧器汽平衡母管;