相关试题
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接触式温度计由于结构简单，可靠不但能测量表面温度，而且可测量物体内部的温度，因此应用较广
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机械厂冷加工工种常采用产量定额，热加工工种常采用工时定额
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当蜗杆、蜗条副磨损后，侧隙过大需要修理时，通常是采用更换蜗杆而研刮蜗条的方法修复
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修复滑动轴承的主轴时，其修理基准和主轴精度检查的基准是主轴两端中心孔
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随着设备动态测试技术的发展，形成了工作精度检验超差的概念，也形成了工件精度故障的概念，工件精度是设备在工作中，即受力运行的状况下，设备综合情况的反映
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机床液压系统常用的节流缓冲装置有环状间隙式。节流口可调式和节流口可变式
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对于八段长达6m 的工作台导轨，拼装后的技术要求是，两导轨直径的平行度大于0.035mm/6000mm
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闸力开关、铁壳开关、按钮、转换开关等均属于手控电器
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齿轮联轴器的齿轮不需要具有较高的加工精度，运转时的润滑也不需要太充分
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生产单位合格产品所消耗的劳动时间越少，生产率就越高
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框式水平仪能测量V 型导轨在垂直面和水平面内的直线度误差
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在高精度滑动轴承组的装配工艺要点中，检验轴套时，是沿孔长方向取两、三处，作相互平行方向上的检验
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能控制生产机械运动行程和位置的方法称为位置控制
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激光具有能量集中，方向性和相干性好等优点。因此，超长导轨的直线度，常采用激光准直仪进行测量
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机械设备二级保养，设备维修人员为主，设备操作人员参加的对设备的定期大修，称为机械设备二级保养
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三坐标测量机是利用点位测量原理工作的，机借助测量机采集零件表面上一系列有意义的空间点，然后通过数字处理，求得这些点组成的特定几何元素的位置及其范围
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液压泵在吸油过程中，必须保证油箱与大气接通
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调整Y225 型铣齿机床鞍镶条时，如果调整太松，会加快导轨面磨损，同时还会引起爬行和振动
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精密环形圆导轨在加工时，外圆采用磨削，内孔珩磨可达精密的配合
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为了制造和刃磨方便，丝锥上的容屑槽一般做成直槽
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粘接：借助胶粘剂把不同的材料连接成一个牢固整体的方法称为粘接。在设备修理中经常以粘代焊，以粘代铆，以粘代安全紧固
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对于动不平衡的转子，许用不平衡量［e］在选定平衡精度A值后，可由A=［e］w/1000mm/s公式求得
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垫铁的长度常为200 250 500 三种
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高速机械装配修理工作的特点主要是保证机械工作时的振动要求
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劳动既是个人谋生的手段，也是为社会服务的途径
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铜-锡合金不能用来做工业上的二元合金电镀镀层合金
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应用光学量仪与光学直角头附件可建立与基准视线垂直的辅助视线
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高速机械轴系对温度变化的适应性不能超过允许值-40°C～+50°C
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在静压轴承的工作原理中，当轴没有受到外载荷时，如果四个节流器阻力相同，而四个油腔的压力不相同
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钻半圆孔时，要用手动进刀，压力要轻，以免吃刀太多，损坏钻头
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目前镀铬工艺中，应用最为广泛的催化剂是盐酸
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冷处理的常用温度为-80-60℃，一般情况下冷处理温度可以达到-120℃
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把滚动轴承间隙调整到零值时，各滚动体受力均匀，刚度增加
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制定劳动定额时，用经验估工法准确性差，而用技术测定法准确性高
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在滚珠丝杠副的轴向间隙的预紧调整法中，双螺母垫片调整预紧式可实现定量精密微调
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在机床导轨高频感应淬火工艺中，淬火层的深度是一个重要的工艺指标，而淬火层的深度主要决定于加热电源的频率，频率越高，则淬火深度越浅
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精密零件在加工过程中最后须经时效处理，其目的是提高材料的综合力学性能
推荐试题
【单选题】
( ) 29. What is the writer's main purpose（目的）in writing this passage？
A．To tell the readers his life story．
B．To tell people what kind of person his father was．
C．To tell the readers what present he got from his father．
D． To let people know how poor he was．
【单选题】
( ) 30. Why did the father not ask his son not to do this and do that？
A．Because he felt quite confident of his son．
B．Because he was born from a poor family．
C．Because he was a man of few words．
D．Because he didn't want to be much too strict with his son．
【单选题】
( ) 31. What would someone learn from this passage？
A．How to live by oneself． B．How to stand on one's own feet．
C．What a good father should do． D．What the self-important is like．
【单选题】
( ) 32. What may be the proper Chinese for the underlined part in the passage？
A．闲暇时光 B．学费 C．精神空虚 D．经济不足
【单选题】
( ) 33. Why did Natalie Smith pay for the six cars behind her?
A. She had seven tickets.
B. She hoped to please others.
C. She knew the car drivers well.
D. She wanted to show kindness.
【单选题】
( ) 34. Judy Foreman copied down the phrase because she ___ .
A. thought it was beautifully written
B. wanted to know what it really meant
C. decided to write it on a warehouse wall
D. wanted her husband to put it up in the classroom
【单选题】
( ) 35. Who came up with the phrase according to the passage?
A. Judy Foreman. B. Natalie Smith. C. Anne Herbert D. Alice Johnson.
【单选题】
( ) 36. What can we infer from the last paragraph?
A. People should practice random kindness to those in need.
B. People who receive kindness are likely to offer it to others.
C. People should practice random kindness to strangers they meet.
D. People who receive kindness are likely to pay it back to the giver.
【单选题】
( ) 37.The greatest river for navigation is ___________.
A. the Nile B. the Amazon C. the Mekong D. the Mississippi
【单选题】
( ) 38. From a dam, people can use the water for ___________.
A. keeping the rivers clean B. only making electricity
C. irrigation and making electricity D. washing clothes
【单选题】
( ) 39. The water in the river is polluted because of _____________.
A. people's drinking water too much B. people's swimming in the river too much
C. chemicals and other materials D. people's building a dam across a river
【单选题】
( ) 40. The best title of the passage is ___________.
A. Rivers in Cities B. The importance of Rivers
C. Transportation D. Natural Resources
【单选题】
) 1. Even Tony’s six-year-old son asked him ______ smoking.
A. stops B. stopped C. to stop D. stopping
【单选题】
2.—What do you think of the lecture of Li Yang’s Crazy English?
— I think it’s _______ , but someone thinks it’s much too ________.
A. wonderful enough; bored B. enough wonderful; boring
C. enough wonderful; bored D. wonderful enough; boring
【单选题】
3.—He didn’t go to the lecture this morning, did he?
— _____ ．Though he was not feeling very well．
A. No, he didnt B. Yes; he did C. No, he did D. Yes, he didnt
【单选题】
4. If you read a lot, your life ______ full of pleasure.
A. will be B. is C. be D. was
【单选题】
5. The black bag _________ be Annas. She has a blue one.
A. should B. cant C. wouldnt D. could
【单选题】
6. Susan, why are you still here? They are all ready to start.
Im sorry, but I _________ when to start.
A. dont tell B. wasnt told C. didnt tell D. havent told
【单选题】
7.—Why dont you choose the red tie?
—For me, it doesn’t _____ my shirt very well．
A. fix B. accept C. compare D. match
【单选题】
8. — Could you tell me ______? I must find him．
— Sorry．I don’t know．But he was here just now．
A. where Tom was B. where Tom is
C. where has Tom gone D. where can I find Tom
【单选题】
9. —What did Mr Green say to you?
— What a heavy rain! How did you come here? He asked________.
A. at all B. in fact C. in surprise D. as a result
【单选题】
10. I often see Tom on the playground．When I passed the playground yesterday, I saw him ．
A. play; playing B. to play; play C. playing; to play D. playing; play
【单选题】
11. — Mum, could I have ____________ to drink?
— Oh, dear．You can only drink some water．There is _________ in the kitchen．
A. anything; else something B. anything; something else
C. something; else nothing D. something; nothing else
【单选题】
12. We all know that learning a foreign language _______ time and effort.
A. requires B. reduces C. removes D. repeats
【单选题】
13. Her son __________ Coke, but now he __________ milk．
A. is used to drinking; used to drink B. used to drink; uses to drink
C. used to drink; is used to drinking D. is used to drink; is drinking
【单选题】
14. I don’t know the teacher is talking with Miss Wang．
A. what B. whom C. who D. which
【单选题】
15.Millie does __________ that many people are thankful to her．
A. such an important and helpful job B. so important and helpful work
C. a very important and helpful job D. such an important and helpful work
【单选题】
16. I think eating more vegetables is good _______ our health.
—Yes, I agree _______ you.
A. at, to B. for, with C. to, to D. for, to
【单选题】
17. I often go on holiday with my parents _____ summer.
A. in B. at C. on D. of
【单选题】
18. I called you at 4:00 yesterday afternoon, but nobody answered.
Sorry, I ______ with my friends at that time.
A. had swum B. swam C. would swim D. was swimming
【单选题】
19.––Who is on the playground? ---__________．
A. Never B. None C. No one D. A lot
【单选题】
20. The schoolboy ______ a blind man cross the street yesterday.
A. helps B. helped C. will help D. has helped
【单选题】
21. —The 2010 World Expo which will last 184 days will be held in Shanghai on May 1st.
—________exciting news! We shall try our best to support it.
A. How B. How an C. What D. What an
【单选题】
22. They preferred ______ in bed rather than _____ horses．
A. to lie; to ride B. lying; riding C. lying; ride D. to lie; ride
【单选题】
23. —What was Jim wearing at the party?
— Nothing _______. He was in his usual shirt and jeans.
A. special B. simple C. important D. interesting
【单选题】
24. The 2016 Olympic Games ________ in Brazil. Would you like to go there?
Maybe, if possible.
A. are held B. will be held C. were held D. have been held
【单选题】
25. — David, look at the man in white over there．Can you tell me _______ ?
—He is a doctor．
A. who is he B. who he is C．what does he do D. what he does
【单选题】
( ) 26.With help from a Mr. H, you can__________.
A. stop wearing your watch B. get new books and objects
C. finish your homework on time D. know when parents or teachers are near
【单选题】
( ) 27. A PENGO WATCH CONTROL can help you to ______________.
A. repair your TV B. put away your books and objects
C. become a James Bond D. get a daily weather report
【单选题】
( ) 28. You can get your Mr. H for___________.
A. $299 B. $499 C. $199 D. $99
