相关试题
【判断题】
用声功率检测机床噪声时,机床的长度小于1.5m，可把整个机床选为基准体
【判断题】
运动曲线在圆柱面上的凸轮，一般都在工作图上划出展开图
【判断题】
切削刃分为主切削刃、副切削刃、备用切削刃
【判断题】
在斜度较大的斜面上钻孔时，可先用比孔经略大的立铣出一个写钻头轴线向垂直的平面，然后在钻孔
【判断题】
桥板与导轨接触部分可调整替换，适应多种机床导轨的测量
【判断题】
用“几个相交的剖切平面”画剖视图时，应先剖切后旋转，旋转到与某一选定的投影面平行再投射
【判断题】
调查现状，方案的制定，可以调查现状，了解现状为基础
【判断题】
动平衡机一般由驱动系统，支承系统，解算和标准电路，以及幅值和相位指示系统等组成
【判断题】
误差抵消调整法是通过调整某些相关零件误差的方向，使其互相抵消。这样各相关零件的公差可以扩大，同时又保证了装配精度
【判断题】
热继电器主要用于电动机的过载保护、断相保护等
【判断题】
机床传动链的误差分析中，如果是降速运动，传动件的误差被缩小
【判断题】
通常所指的噪声是人耳能接触觉到的空气噪声，一般频率在20～20000Hz之间，低于20Hz的机械波称为声波，高于20 2000Hz的机械波称为超声波
【判断题】
在数控机床的试运行中，除了操作失误引起的故障外，不允许机床有故障出现，否则表明机床的安装调试有问题
【判断题】
检验棒主要用来检查主轴套筒类零部件的径向园跳动，轴向窜动同轴度,平行度及其与导轨的平行度等精度项目
【判断题】
大型机床的床身直导轨，通常是机床总装后各部件相对位置的基准
【判断题】
测量器具误差是指测量器具本身固有的误差，也与外部条件有一定关系
【判断题】
大型机床床身拼接安装完后，都必须进行检测，如果不符合规定的精度要求，就必须进行调整
【判断题】
轴系找中误差不大,并符合技术要求，就不会对机械振动和使用寿命带来不良影响
【判断题】
精密水准仪的特点，望远镜的放大倍数率不小于40倍，水准管分划值小于2″/2mm，带有平行玻璃板测微器读数装置，最大分划值可达到0.05mm，带有通用的精密水准尺
【判断题】
防止周围环境中的水汽、二氧化硫等有害介质侵蚀是润滑剂洗涤作用
【判断题】
设备修理网络计划是“横道图”，它能直观地显示出生产任务的关键路线，关键节点，修理工艺的先后顺序和相互关系，以及完成每个节点的进度要求，按照设备大修程序，进度安排一般都是先进后松，以确保周期
【判断题】
安装时，液压泵一般有电动机通过联轴器直接传动，不可用V 带传动
【判断题】
修理工艺，由主管工艺人员提出修理项目，生产科落实并核准劳动、运输、工具、专用检具和其他费用的总价格
【判断题】
装配不可分离型圆柱孔轴承(如深沟球轴承、调心球轴承、角接触轴承等)时， 应按座圈配合的松紧程度决定其装配顺序
【判断题】
在各工厂制定的技术文件中，一般都不习惯用水平仪的格数来表示允差值
【判断题】
动平衡的平衡方法是调整两支梁停止振动或振动的振幅在规定的允许范围以内
【判断题】
公差等级相同，其加工精度一定相同，公差数值相等时，其加工精度不一定相同
【判断题】
设备修理网络计划是应用网络理论制定的修理计划，网络计划对修理计划进行监督，评价和指导，是一种科学的， 组织和管理生产的方法
【判断题】
水平仪可用来测量零件平面的平面度误差、直线度误差、垂直度误差等
【判断题】
大型设备双立柱安装时，要求两立柱导轨相互平行，且只允许两立柱下端靠近
【判断题】
T68主轴结构是三层结构，改进后的二层三轴结构多了一层配合误差，轴承误差，三层结构支撑零件多，主轴刚性低，主轴刚套与空心轴的润滑困难，这些缺点都会对额加工工件孔的精度产生很大的影响，当前产生的镗床基本上主轴结构都为三层结构
【判断题】
采用双螺母螺纹式调整滚珠丝杠轴向间隙的方法结构紧凑，调整方便，应用广泛
【判断题】
班组的费用核算主要是指更换配件，材料，改造未预见的更换件，配件和材料。这些费用若计算在承包费或额定工时内，则要从节约成本的原则出发，既在保证周期，保证质量的前提下，尽可能多换多修，多代少领
【判断题】
要认真进行操作培训总结，在培训结束时，指导者应对学员在培训过程中个方面的表现进行总结和讲评，对其优点要进行表扬，对其不足要进行指正，从而有利于学员操作水平的不断提高
【判断题】
当水平仪倾斜一个角度时，气泡就移动一个距离，根据气泡的偏移量能精确的反映水准管倾斜角度
【判断题】
生产热轧螺纹钢的连续生产加工实例不属于压力加工范畴
推荐试题
【单选题】
Tony is very disappointed _______ the results of the exam.
A. with
B. for
C. toward
D. on
【单选题】
William Penn, the founder of Pennsylvania, _________ defended the right of every citizen to freedom of choice in religion.
A. peculiarly
B. indifferently
C. vigorously
D. inevitably
【单选题】
When people become unemployed, it is _______ which is often worse than lack of wages.___
A. laziness
B. poverty
C. idleness
D. inability
【单选题】
In previous times, then fresh meat was in short __________, pigeons were kept by many households as a source of food.
A. store
B. provision
C. reserve
D. supply
【单选题】
Those gifts of rare books that were given to us were deeply _________.___
A. appreciated
B. approved
C. appealed
D. applied
【单选题】
It is our ___________ policy that we will achieve unity through peaceful means.___
A. consistent
B. continuous
C. considerate
D. continual
【单选题】
He is __________ about his chances of winning a gold medal in the Olympics next year.___
A. optimistic
B. optional
C. outstanding
D. obvious
【单选题】
The director was critical _______________ the way we were doing the work.___
A. at
B. in
C. of
D. with
【单选题】
In a sudden _____________ of anger, the man tore up everything within reach.___
A. attack
B. burst
C. split
D. blast
【单选题】
In Britain people _____________ four million tons of potatoes every year.___
A. swallow
B. dispose
C. consume
D. exhaust
【单选题】
I'd _____________ his reputation with other farmers and business people in the community, and then make a decision about whether or not to approve a loan.___
A. take into account
B. account for
C. make up for
D. make out
【单选题】
She cooked the meat for a long time so as to make it _____________ enough to eat.___
A. mild
B. slight
C. light
D. tender
【单选题】
The computer revolution may well change society as _____________ as did the Industrial Revolution.___
A. certainly
B. insignificantly
C. fundamentally
D. comparatively
【单选题】
A lot of ants are always invading my kitchen. They are a thorough ___________.___
A. nuisance
B. trouble
C. worry
D. anxiety
【单选题】
As we can no longer wait for the delivery of our order, we have to _________ it.___
A. postpone
B. refuse
C. delay
D. cancel
【单选题】
When a fire _________ at the National Exhibition in London, at least ten priceless paintings were completely destroyed.___
A. broke of
B. broke out
C. broke down
D. broke up
【单选题】
The destruction of these treasures was a loss for mankind that no amount of money could __________.___
A. stand up to
B. make up for
C. come up with
D. put up with
【单选题】
The student was just about to ___________ the questions, when suddenly he found the answer.___
A. arrive at
B. submit to
C. work out
D. give up
【单选题】
When there are small children around, it is necessary to put bottles of pills out of _________.___
A. reach
B. hand
C. hold
D. place
【单选题】
The _________ of blood always makes him feel sick.___
A. sight
B. view
C. look
D. form
【单选题】
In Britain, the best season of the year is probably __________ spring.___
A. later
B. last
C. latter
D. late
【单选题】
Free medical treatment in this country covers sickness of mind as well as _________ sickness.___
A. normal
B. regular
C. average
D. ordinary
【单选题】
Although he had looked through all the reference material on the subject, he still found it hard to understand this point and her explanation only _________ to his confusion.___
A. extended
B. amounted
C. added
D. turned
【单选题】
A completely new situation will ___________ when the examination system comes into existence.___
A. arise
B. rise
C. raise
D. arouse
【单选题】
Cancer is second only __________ heart disease as a cause of death.___
A. of
B. to
C. with
D. from
【单选题】
The manager needs an assistant that he can _________ to take care of problems in his absence.___
A. count on
B. count in
C. count up
D. count out
【单选题】
We gave out a cheer when the red roof of the cottage came __________ view.___
A. from
B. in
C. before
D. into
【单选题】
They took ________ measures to prevent poisonous gases from escaping.___
A. fruitful
B. beneficial
C. valid
D. effective
【单选题】
Doing your homework is a sure way to improve your test scores, and this is especially true _______ it comes to classroom tests.___
A. when
B. since
C. before
D. after
【单选题】
In developing countries people are _______ into overcrowded cities in great numbers.___
A. breaking
B. filling
C. pouring
D. hurrying
【单选题】
There are other problems which I don't propose to ____________ at the moment.___
A. go into
B. go around
C. go for
D. go up
【单选题】
It is quite necessary for a qualified teacher to have good manners and _________ knowledge.___
A. extensive
B. expansive
C. intensive
D. expensive
【单选题】
I'm not sure whether I can gain any profit from the investment, so I can't make a(n) ______ promise to help you.___
A. exact
B. defined
C. definite
D. sure
【单选题】
The sports meet, originally due to be held last Friday, was finally ________ because of the bad weather.___
A. set off
B. broken off
C. worn off
D. called off
【单选题】
It has been revealed that some government leaders _______ their authority and position to get illegal profits for themselves.___
A. employ
B. take
C. abuse
D. overlook
【单选题】
Shelly had prepared carefully for her biology examination so that she could be sure of passing it on her first ________.___
A. intention
B. attempt
C. purpose
D. desire
【单选题】
The store had to _______ a number of clerks because sales were down.___
A. lay out
B. lay off
C. lay aside
D. lay down
【单选题】
All the students in this class passed the English exam ________ the exception of Li Ming.___
A. on
B. in
C. for
D. with
【单选题】
Writing is a slow process, requiring _______ thought, time, and effort.___
A. significant
B. considerable
C. enormous
D. numerous
【单选题】
Lightning is a ______ of electrical current from a cloud to the ground or from one cloud to another.___
A. rush
B. rainbow
C. rack
D. ribbon
