相关试题
【单选题】
液体中单位面积上的液体力称为液体压强，用___表示。
【单选题】
单活塞杆液压缸的有杆腔和无杆腔的有效工作面积不等，当压力油以相同的压力和流量分别进入缸的两腔时，活塞在两个方向的速度和___不相等。
【单选题】
数控机床液压卡盘处于正卡且在低压夹紧状态下，其夹紧力的大小是由___管路上的减压阀来调节的。
【单选题】
如下图 3 YA 失电、1YA 得电，换向阀 2 和换向阀 1 均位于___位。
【单选题】
机床拆卸时最后按先外后内、先上后下的___，分别将各部件分解成零件。
【单选题】
机床组装时首先___的安装。
A. 床身与床脚
B. 齿条
C. 刀架
D. 电气
【单选题】
按故障造成的后果分危害性故障、___。
【单选题】
C.先天性故障 D.部分性故障13116.目前高速主轴多数采用___轴承。
A. 陶瓷滚动
B. 角接触球轴承
C. 向心
D. 推力
【单选题】
主轴内刀具的自动夹紧装置松刀时，通过___活塞推动拉杆来压缩碟形弹簧，使夹头涨开。
A. 液压缸
B. 液压马达
C. 液压泵
D. 节流阀
【单选题】
在主轴前端设置一个___键，当刀具装入主轴时，刀柄上的键槽必须与突键对准，才 能顺利换刀。
【单选题】
诊断的步骤包括___。
A. 要确定运行状态检测的内容、建立测试系统，特征提取，制定决策都正确
B. 特征提取
C. 制定决策
D. 要确定运行状态检测的内容、建立测试系统
【单选题】
丝杠窜动引起的故障检查的顺序大致为：伺服驱动装置、电动机及测量器件、电动机与 丝杠连接部分、液压平衡装置、开口螺母和滚珠丝杠、___、其他机械部分。
A. 轴承
B. 电气开关
C. 变压器
D. 接触器
【单选题】
主轴头通常有卧式和立式两种，常用转塔的___来更换主轴头，以实现自动换刀。
【单选题】
数铣加工过程中，按了紧急停止按钮后，应___。
A. 手动返回参考点
B. 排除故障后接着走
C. 重新装夹工件
D. 重新上刀13136.数控系统的手动进给值一般采用（ ）输入。
【单选题】
对 ISO EOB FMS MDI 的正确解释是___。
A. 国际标准化组织、程序段结束符、柔性制造系统、手动数据输入
B. 美国工业电子协会、程序结束符、集成制造系统、自动运行
C. 美国工业电子协会、程序段结束符、柔性制造系统、自动运行
D. 国际标准化组织、程序结束符、集成制造系统、手动数据输入
【单选题】
C.附加坐标系原点 D.加工程序原点13140.数控机床的准停功能主要用于___。
A. 换刀和让刀
B. 退刀
C. 换刀和加工中
D. 测量工件时
【单选题】
按下数控系统的___按钮，机床开始在程序的控制下加工零件。
A. 循环启动
B. 主轴正传
C. 暂停
D. 复位
【单选题】
数控车床在执行刚性攻丝时，___每旋转一转，沿攻丝轴产生一定的进给（螺纹导程）。
A. X轴
B. 进给轴
C. Z 轴
D. 主轴
【单选题】
如果数控系统某个扩展I/O 模块的 DI、DO、AI、AO 数量全部设为 0，系统认为该站号___。
A. 有效
B. 只有在机床空载时有效
C. 无效
D. 只有在机床空载时无效
【单选题】
数控机床不同螺距的丝杠与各种步距角的电机相配时，通过___设定，可以使编程与实际运动距离保持一致。
A. 电子齿轮比参数
B. 切削速度上限值
C. 升、降速时间常数
D. 螺距误差补偿参数
【单选题】
___。
A. 0.016mm
B. 0.035mm
C. 0.040mm
D. 0.025mm
【单选题】
指示器和专用检验棒，检验时将指示器___主轴锥孔中的专用检验棒上。
【单选题】
数控铣床主轴箱在 Z 坐标方向移动的直线度检测时工作台位于行程的___位置，角尺放在工作台面上横向垂直平面内和纵向垂直平面内。
【单选题】
三个轴之位移量测系统经数据处理器或计算机等计算出___的各点坐标（x，y，z） 及各项功能量测的仪器。
【单选题】
数控机床的定位精度主要检测单轴定位精度、单轴重复定位精度和两轴以上联动加工出试件的___。
A. 圆度
B. 表面粗糙度
C. 平行度
D. 平面度
【单选题】
泵浦可激活介质内部的一种___，使其在某些能级间实现粒子数反转分布，这是形成激光的前提条件。
【单选题】
垂直度实际轴线必须位于___于基准平面，且在给定的方向上，距离为公差值 0.1mm 的另平行平面之间，如下图所示。
【单选题】
下图显示，实际面（或轴线）必须位于距离为公差值 0.05，且___于基准平面的两平行面之间。
【单选题】
通常说刀具锐利，是说___。
A. 刃口圆弧半径很小和前角较大
B. 刀尖很小C.前角较小和后角较大 D.刃口锋利
【单选题】
数控铣床使用的刀具一般可分为___等形式。
A. 组合式、模块式、整体式
B. 镶片式、模块式、组合式C.焊接式、机夹式、整体式 D.机夹式、组合式、镶片式
【单选题】
C.铣刀安装误差 D.工具磨床主轴的摆动13177.夹紧力作用方向最好指向工件刚度最___的方向。
【单选题】
对于需要在轴向固定其他零件的工件，可选用___中心孔。
A. C 型
B. B 型
C. A 型
D. D 型
【单选题】
选择切削用量的原则时要在机床动力和___允许，又能满足加工表面粗糙度的前提下， 选取尽可能大的进给量。
【单选题】
粗加工余量极不均匀时，可选用两次或数次___，视具体情况应先切去不均匀部分。
【单选题】
测量圆柱度误差时，被测件放在精确___的 V 形架内。
A. 平板
B. 虎钳
C. 平口钳
D. 工作台
【单选题】
下图为测量某工件圆锥面对φd 外圆轴线的斜向___误差。
A. 圆跳动
B. 同轴度
C. 垂直度
D. 平行度
【单选题】
政治方面的强制力量，如国家的的权力、人民代表大会的权力、企业法人的权力属于___ 的范畴。
A. 职业权力
B. 职业义务
C. 职业责任
D. 职业纪律
【单选题】
C.有些是相同的 D.没有界定13198.“诚实守信、宽厚待人”的基本内容有___。
推荐试题
【单选题】
John Smith is _____ honest young man.___
【单选题】
She __________ in wearing that old – fashioned hat.___
A. insists
B. persists
C. assists
D. consists
【单选题】
Some of the meat came from Canada. How about________？___
A. another
B. the other
C. others
D. the rest
【单选题】
I have brought you ___ flowers for your birthday. ___
A. few
B. a few
C. little
D. a little
【单选题】
I have also experienced many adventures, but nothing that I have seen ___what you have described. ___
A. compares
B. relates
C. resembles
D. assembles
【单选题】
That young man has made so much noise that he ___ not have been allowed attend the concert. ___
A. could
B. must
C. would
D. should
【单选题】
“What is Mary doing at home?” “She is playing ____.”___
A. a piano
B. her piano
C. piano
D. the piano
【单选题】
I’m busy now ,ask him to see me ____ time.___
A. the other
B. some other
C. other
D. another
【单选题】
The child took a spoonful and tasted it carefully __________ it was hot.___
A. in case
B. provided
C. if
D. unless
【单选题】
The French pianist who had been praised very highly __________ to be a great disappointment. ___
A. turned off
B. turned up
C. turned out
D. turned down
【单选题】
“Shall I turn on the television?” – “No, I’d rather not __________ television tonight.”___
A. have watched
B. to watch
C. watch
D. for watching
【单选题】
They said that they had made up their minds to ____the task in spite of the extremely difficult conditions.___
A. carry on
B. carry off
C. carry away
D. carry forward
【单选题】
The two girls are getting on very well and share with each other. ___
A. little
B. much
C. some
D. none
【单选题】
The teacher said that the classroom was empty __________ a few chairs.___
A. but for
B. except for
C. apart from
D. besides
【单选题】
______you choose， make sure that it is a good one. ___
A. What
B. Wherever
C. Whichever
D. Which
【单选题】
Vingo was released from prison_____the successful efforts of his friends to prove his innocence. ___
A. according to
B. as a result of
C. for reasons of
D. with the help of
【单选题】
Entering the room， I found my father __ at the desk and ___ something .___
A. seat... write
B. seated ... wrote
C. seated ... writing
D. seating ... writing
【单选题】
Cake __________ of flour, sugar, egg and some other ingredients. ___
A. contained
B. consists
C. includes
D. composed
【单选题】
Mr. Peter wanted Steve to take half the money, but Steve did not __________ it. ___
A. obtain
B. achieve
C. accept
D. receive
【单选题】
I'd like to take my picture ________stands a high tower. ___
A. where
B. which
C. that
D. there
【单选题】
__________ the English examination I would have gone to the concert last Saturday. ___
A. But for
B. As for
C. In spite of
D. Because of
【单选题】
Cars moved very slowly in the 1920s, but they ______move more quickly than in 1910.___
A. were to can
B. did
C. will
D. can
【单选题】
The little girl needs __________ after her shock. ___
A. being comforted
B. be comforted
C. comforting
D. comforted
【单选题】
The __________ horse ran away from the fire.___
A. having frightened
B. frightening
C. frightened
D. frighten
【单选题】
He is __________ of an actor. ___
A. anybody
B. anything
C. somebody
D. something
【单选题】
You can take ______ seat you like. ___
A. no matter what
B. no matter which
C. what
D. whichever
【单选题】
He changed his name， _____ that nobody would find out what he had done before. ___
A. having thought
B. to think
C. thinks
D. thinking
【单选题】
----- _______is your English teacher？ ----- The one in red. ___
A. who
B. which
C. what
D. where
【单选题】
Can you give me a light for my cigarette? I have ____my matches.___
A. got out of
B. got rid of
C. got away with
D. run out of
【单选题】
Then the speaker __________ the various factors leading to the present economic crisis.___
A. went for
B. went after
C. went into
D. went on
【单选题】
I know Jonathan quite well and never doubt_____ he can do a good job of it___.
A. whether
B. that
C. when
D. what
【单选题】
I'm afraid it ______ tomorrow, but who knows?___
A. may have rained
B. might rain
C. would rain
D. ought to rain
【单选题】
He has spent ____money on his new house.___
A. a large number of
B. the number of
C. lots of
D. numbers of
【单选题】
This is the hotel __________ I like to stay.___
A. in which
B. at which
C. to which
D. at that
【单选题】
Would you mind keeping a（n）__________on the house for us while we are away？___
A. eye
B. /look
C. hand
D. view
【单选题】
He suggested the sports meet be _______because of the bad weather. ___
A. put away
B. put up
C. put down
D. put off
【单选题】
If the weather is __________ suitable, we will play the football match on Tuesday. ___
A. by means of
B. by any means
C. by no means
D. by all means
【单选题】
_____________is one of the five working languages at U.N. , which _______ are very proud of.___
A. The Chinese, the Chinese
B. Chinese language, Chinese
C. Chinese, the Chinese
D. Chinese language, the Chinese
【单选题】
The war lasted so long that people were tired of it. Everyday there was large crowds of demonstrators _____against the war.___
A. protecting
B. prescribing
C. protesting
D. prosecuting
【单选题】
Tom is so talkative. I’m sure you'll soon get tired ________ him.___
A. of
B. with
C. at
D. on
