【判断题】
对可能受潮或停运超过3周以上的电机应测绝缘合格后方可启动
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相关试题
【判断题】
我中心冷却水分四路进厂房，分别是#1机、#2机、给水泵组和锅炉设备冷却用水；
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润滑油溢油阀连接在润滑油供油母管与回油母管之间
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凝结泵检修时，应先关闭密封水门，后关闭抽空气、凝结水泵入口门，最后开滤网放水
【判断题】
当#2高加汽侧压力高于除氧器压力0.5MPa以上时，将高加输水倒至除氧器
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高加投运时，控制高加水侧出口温度增长率≯5℃/min
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除氧器温度过低，可导致除氧器溶氧不合格
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当环境温度＜-2℃时，空冷防冻保护启动
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汽轮机停运热备时，应采取滑参数停机的方式
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汽轮机启动前盘车应连续运行至少4h以上
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当汽轮机高压上缸温度＜150℃启动时，属于冷态启动方式
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当胀差至＋2.0mm,且继续上升,可适当降低真空的方法调整
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排汽温度空负荷时不超过80℃,满负荷时不超过120℃
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当机组负荷至70%Ne时，在阀门管理中进行“单-顺阀”切换
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汽轮机停机后，当润滑油冷油器出口温度低于35℃时，停冷油器水侧
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汽轮机超速试验后要进行汽轮机调速汽门和主汽门严密性试验
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汽轮机机械超速合格后方可进行电超速试验
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抽汽逆止阀保护试验应在汽轮机正常运行中进行
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汽轮机热井液位至3100mm时，汽轮机跳闸
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汽轮机设备静态试验必须在动态试验合格后方可进行
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汽轮机喷油试验可在汽轮机定速并网前或汽轮机正常运行中进行
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所有汽轮机保护应在机组冲转前投入，低真空保护除外
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汽轮机OPC超速试验合格后方可进行电超速或机械超速试验
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汽轮机调速汽门活动性试验目的是检验调速汽门关闭是否严密
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汽轮机的转动部分包括轴、叶轮、动叶栅、联轴器和盘车装置等
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从干饱和蒸汽加热到一定温度的过热蒸汽所加入的热量叫过热热
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调速系统由感受机构、放大机构、执行机构、反馈机构组成
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企业标准化是围绕实现企业生产目标，使企业的全体成员、各个环节和部门，从纵向到横向的有关生产技术活动达到规范化、程序化和科学化
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具体地说，企业标准化工作就是对企业生产活动中的各种技术标准的制定
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汽轮机负荷增加时，流量增加，各级的焓降均增加
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水蒸气的形成经过五种状态的变化，即未饱和水、饱和水、湿饱和蒸汽、干饱和蒸汽和过热蒸汽
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危急保安器常见的形式有偏心飞环式和偏心飞锤式
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汽轮机常用的联轴器有三种，即刚性联轴器、半挠性联轴器和挠性联轴器
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当流体流动时，在流体层间产生阻力的特性称为流体的黏滞性
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从辐射换热的角度上看，一个物体的吸收率小，则辐射能力强
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目前，火力发电厂防止大气污染的主要措施是安装脱硫装置
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火力发电厂的循环水泵一般采用大流量、高扬程的离心式水泵
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由于受客观条件限制，在运行中暂时无法解决、必须在设备停运时才能解决的设备缺陷，称三类设备缺陷
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【单选题】
This offer is___ for travel before the end of April.
A. effective
B. ineffective
C. invalid
D. valid
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___ to British universities depends on examination results.
A. Admittance
B. Entry
C. Admission
D.
E. ntrance
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The database is only ___ by authorized managers.
A. proved
B. accessible
C. approved
D. access
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This traditional ___ is of indigo blue.
A. clothes
B. diversity
C. costume
D. institution
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These cigarettes are a ___ of the best tobaccos.
A. blend
B. band
C. mixture
D. mess
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The tennis players need total ___ during play.
A. concentration
B. section
C. depression
D. energy
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He ___ that he was innocent.
A. announced
B. declared
C. disclosed
D. admitted
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Columbus discovered America but did not ___ the new continent.
A. seek
B. investigate
C. search
D. explore
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The trees ___their foliage every year.
A. repeat
B. grow
C. refresh
D. renew
【单选题】
Make a list of the various ___.
A. options
B. choice
C. optional
D. samples
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I am well aware that this is a ___ job.
A. rough
B. tough
C. wealthy
D. rogue
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I found their kindness quite ___.
A. strong
B. overweening
C. keen
D. overwhelming
【单选题】
The captain wasn’t ___ on having him in the team.
A. eager
B. keen
C. overwhelmed
D. anxious
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He was ___at the prospect of seeing them again.
A. thrilling
B. blessed
C. thrilled
D. emotional
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They ___ against travelling at night in such a dangerous country.
A. consul
B. advocate
C. counsel
D. recommend
【单选题】
It is absolutely vital that food supplied should be ___.
A. sustained
B. enhanced
C. exhausted
D. maintained
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He must have had an accident, or he ___ then.
A. would have been here
B. had to be here
C. should be here
D. would be here
【单选题】
It was essential that the application forms ___ back before the deadline (截止日期).
A. must be sent
B. would be sent
C. be sent
D. were sent
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We ___ our breakfast when an old man came to the door.
A. just have had
B. have just had
C. just had
D. had just had
【单选题】
The bridge was named ___ the hero who gave his life for the cause of the people.
A. after
B. with
C. by
D. from
【单选题】
It wasn’t such a good dinner ___ she had promised us.
A. that
B. which
C. as
D. what
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The road now ___two kilometers beyond the river.
A. develops
B. extends
C. expands
D. widens
【单选题】
It was claimed that the level of alcohol in the man’s blood was ___ to cause an accident.
A. sufficient
B. adequate
C. enough
D. accurate
【单选题】
Medical care reform has become this country’s most important public health ___.
A. question
B. stuff
C. matter
D. problem
【单选题】
His retail business in the city___ rapidly between the wars.
A. enlarged
B. extended
C. widened
D. expanded
【单选题】
Many frogs ___ the sound of their voice using special sacs(囊) in their throat.
A. amplify
B. widen
C. expand
D. enlarge
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Some old people don’t like pop songs because they cannot ___ so much noise.
A. resist
B. sustain
C. tolerate
D. undergo
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I have kept that portrait where I can see it every day, as it always ___ me of my university days in London.
A. recollects
B. reminds
C. recalls
D. invokes
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The article suggests that when a person is under unusual ___ he should be especially careful to have a well-balanced diet.
A. weight
B. stress
C. press
D. nerve
【单选题】
You should hire a more ___ manager than the one you currently have.
A. sufficient
B. effective
C. respective
D. efficient
【单选题】
Surgeons began to ___ their hands and arms with soap and water before operating.
A. scrub
B. enhance
C. rub
D. exhibit
【单选题】
He might let something ___ in a moment of weakness.
A. slip
B. leak
C. to slip
D. to leak
【单选题】
Do not ___ the salad until you are ready to serve.
A. mix
B. toss
C. fling
D. eat
【单选题】
The ___ for which he had fought all his life no longer seemed important to him.
A. aims
B. objectives
C. subjects
D. goals
【单选题】
You should pause and ___ now.
A. tweet
B. ponder
C. squander
D. gossip
【单选题】
Eating too much fat can ____heart disease and cause high blood pressure.
A. contribute to
B. attribute to
C. attest to
D. devote to
【单选题】
It soon ___ that what she loved was not my person but my wealth.
A. widened
B. expanded
C. extended
D. developed
【单选题】
I want to buy a new tie to ___ this brown suit.
A. go into
B. go after
C. go with
D. go through
【单选题】
Our company decided to ___ the contract because a number of the conditions in it had not been met.
A. destroy
B. resist
C. assume
D. cancel
【单选题】
My first ___ was to turn and run.
A. institute
B. institution
C. instinct
D. tuition
