相关试题
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中小型凸轮在分度头上划线较方便，首先划中心十字线，接着划射线或等距线
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影响蜗轮副啮合精度的程度，以蜗轮轴线倾斜为最大，蜗杆轴线对蜗轮中心平面偏移为其次，而中心距误差为最小
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液态静压轴承的承载能力取决于静压油腔间的压力差
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在平衡旋转体前，应先接通电测箱电源，空转 20 分钟后方可开始校平衡
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要重视安全教育，指导者在讲解各项操作时，还应详细地讲解生产操作规程及现场事故处理的有关规定，使学员牢固地掌握安全生产的相关知识
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研刮蜗条可利用旧蜗杆作研具,须对旧蜗杆的螺纹精车修整,修整旧蜗杆时齿厚尺寸没有严格要求，但表面粗糙度和螺纹精度必须满足要求
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精密磨床，主轴轴承工作面研磨时，尺可能竖研，研磨棒旋转方向与主轴旋转方向相反
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为实现电动机连续正转运行需采用具有接触器自锁的控制线路和手动正转控制回路
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平等自愿原则包括两层含义，一是平等原则，一是自愿原则
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数控机床的软件故障只要改变程序内容，修改机床参数设定就能排除故障
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油液在液压系统中流动要克服摩擦阻力，将全部机械能转变为热能，使油温升高，一般液压机床油温不得超过60o℃
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液压泵安装前，要保证活塞与活塞杆的同轴度及活塞杆的直线度
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润滑脂的主要种类有：钠基润滑脂、钙基润滑脂、锂基润滑脂、铝基及复合铝基润滑脂、二硫化目润滑脂、石墨润滑脂等
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环形导轨（又称圆形导轨）多用于立式车床和立式磨床的工作台回转支承
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单位时间内生产出的产品数量越多，生产率就越高
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在机械装配和修理中，经纬仪可以测量精密机床水平转台圆环形导轨分度误差
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机床传动链精度的检查方法中，数字计数法方法简单，分辨率和测量精度高
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麻花钻顶角大小影响主切削刃上轴向力的大小。顶角愈小，外缘处刀尖角增大，有利于散热和提高钻头寿命
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使用绝缘用具的规则中的要求：每次使用前必须检查，发现有漏气和破裂的不准使用，绝缘用具必须每年进行一次耐压试验，有耐压试验合格证明不准使用
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若静压轴承的最佳节流比不符合要求时，可通过调整滤油器的方法来解决
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高速旋转的机械，启动试运转，通常不能突然加速，但可在短时间内升速至额定工作转速
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超深孔加工常见质量差的现象是孔圆柱度、圆度、母线直线度达不到要求，孔表面质量差
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方尺和90°角尺精度分为4 级，分别以0、1、2、3 表示
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丙烯酸粘接材料，具有优良的物理和电子性能，粘接强度高，可用于钢铁，有色金属等多种产口粘接。广泛应用于机器仪表，电子电器等产品中
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静平衡在转子两个校正面上同时进行校正平衡，校正后的剩余不平衡量，以保证转子在动态时是在许用不平衡量的规定范围内
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公法线千分尺用于测量齿轮公法线长度时，两个测砧的测量面做成相互垂直的圆平面
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高速机械转子上各端面对轴心线的垂直度误差过大，会引起转子旋转时的振动
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在平衡旋转体前，应先接通电测箱电源，预热15分钟后方可开始校平衡
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蓝油常用作精密工件和有色金属及其合金工件刮削的显示剂
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缩短基本时间、缩短辅助时间、缩短准备与结束时间均可以提高劳动生产率
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在高空作业过程中如发现有安全隐患时，必须及时解决；危机人身安全时，必须停止作业
【判断题】
热处理能够提高零件加工质量，减小刀具磨损
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采用多刀切削可以同时加工几个表面，只缩短基本时间，不能缩短辅助时间
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位置开关又称限位开关，它的作用与按钮开关有所不同
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当Y3150型滚齿机刀架进给丝杠的清隙油缸压力过低时，会引起刀架垂直进给爬行
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钢丝绳的绳套应有铁套环，用编结法结成绳套时，编结部分的长度不小于钢丝绳直径的15倍，并且不得短于300mm，用卡子连接绳套时，卡子不得少于3个
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在安装液压泵时，不允许用三角皮带直接带动泵轴转动
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用光学平直仪器测量时，可按作图或计算两种方法求出导轨的不直度
推荐试题
【单选题】
- Excuse me, when will the 17:15 train arrive____
A. I don't tell you.
B. It's been delayed one hour.
C. You have to be patient.
D. Don't ask me.
【单选题】
- Is John there?____
A. Speaking.
B. I'm not Mary.
C. Who are you?
D. Mary is well today.
【单选题】
- Would you like to join us for Sunday dinner____
A. It's nice of you to invite me.
B. How about the food?
C. I like onion soup.
D. I'm sorry I missed the fun last time.
【单选题】
- Could you tell me where the nearest parking lot is?____
A. Don't ask me.
B. Parking is very difficult.
C. Sorry, I'm a stranger here.
D. Sorry, you can't park here.
【单选题】
- Sorry, ___
A. here you are.
B. take it.
C. it's taken.
D. never mind.
【单选题】
－What's this in English? ____
A. It's a map.
B. That is a map.
C. Yes, it's a map.
D. No, it isn't.
【单选题】
- I hear you got through your exam. Congratulations!____
A. No. I didn't do well enough.
B. Who told you that?
C. Thanks.
D. Yes, I got a good mark.
【单选题】
- Don't forget to come to my party this evening!___
A. I can't.
B. I won't.
C. I don't.
D. I will.
【单选题】
- Jim, please don't put your head out of the window on the bus. It's dangerous!___
A. Good idea.
B. Sorry, I won't do it again.
C. It doesn't matter.
D. It's good.
【单选题】
-How about going fishing?___, I have no patience for that.
A. Excuse me
B. Sorry
C. Pardon
D. Apologize
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- Thanks for the lovely and delicious food______.
A. No thanks
B. Never mind
C. All right
D. My pleasure
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－ Haven't seen you for ages. Let's have a get-together next week._____
A. Great idea.
B. Welcome!
C. Yes, of course.
D. No, thanks.
【单选题】
- Do you mind if I switch off the radio? ______. Go ahead.
A. Never mind
B. No way
C. No, not at all
D. No, you'd better not
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- Could I use your bike for a moment? ___
A. It's well.
B. It doesn't matter.
C. By all means.
D. I have no idea.
【单选题】
-How do you like the story?_______.
A. I'd like to read it
B. I like it very much
C. fine, thank you
D. It's very interesting
【单选题】
- I'll sorry to trouble you.______.
A. Don't say so
B. OK
C. It doesn't matter
D. That's fight
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- We ordered 20 boxes of your products, but we have only got 19. - ____
A. You do not have to.
B. It does not matter.
C. We will send another tomorrow.
D. Nothing serious.
【单选题】
--Will you please give the note to him? _________.
A. Certainly, I'll give it to him
B. No, please not
C. Sorry, I don't
D. Yes, please do
【单选题】
- Thank you ever so much for your lovely gift____
A. Never mind
B. I'm glad you like it.
C. Please don't say so.
D. No, It's not so good.
【单选题】
- I'd like to invite you to dinner this Saturday, Mr. Smith.____
A. Oh, no. let's not.
B. I'd rather stay at home.
C. I'm sorry, but I have other plans.
D. Oh, no. That'll be too much trouble.
【单选题】
- Could you please open the window?____
A. I can't.
B. Go ahead.
C. Sure.
D. It's really very kind.
【单选题】
- Do you think I can borrow your bike for a few hours?____
A. I'm afraid you can.
B. I'm sorry, but I really need it this afternoon.
C. Yes, I don't think so.
D. I'll think about it later.
【单选题】
- Thank you very much for the dictionary you sent me.____
A. No thanks.
B. I'm glad you like it.
C. Please don't say so.
D. No, it's not so good.
【单选题】
- How do you like the movie we saw yesterday?____
A. You are welcome.
B. How about you?
C. I've never seen a better movie than it.
D. It is very expensive.
【单选题】
- What do you think of your new teacher____
A. He came to teach us last week.
B. He teaches us English.
C. He has two children.
D. He is very nice.
【单选题】
- Are you going to have a holiday?____
A. Not until next week.
B. Three weeks ago.
C. To Beijing.
D. I'm pleased to hear that.
【单选题】
- You seem to be lost. Need help? ____
A. Yes, would you please help me with the bag?
B. Help me find my key, please.
C. Yes, with pleasure.
D. I'm looking for Zhongshan Road.
【单选题】
- Can you help me clear up the mess____
A. Yes, it doesn't matter.
B. No, that's OK.
C. Yes, help yourself.
D. No problem.
【单选题】
- Does No.20 bus stop at our school?____
A. I go to school by bus.
B. I'm afraid not.
C. You are welcome.
D. I'll not take No.20 bus.
【单选题】
- Can I help you? ____
A. Sorry, I don't need your help.
B. What help can you give us?
C. I'd like to try on these shoes, please.
D. Thanks. You are welcome.
【单选题】
- Sorry to have kept you waiting. ____
A. That's OK.
B. What are you doing?
C. What's wrong with you?
D. Where have you been?
【单选题】
- What is she?____
A. She is a typist.
B. She is talking to her friend.
C. She is having a holiday.
D. She is my sister.
【单选题】
- That's a beautiful cat. I wonder who it belongs to.____
A. It belongs to the
B. rowns. B.The cat is my favourite too.
C. Mind your own business.
D. I can't say anything more.
【单选题】
- Excuse me, could you tell me the time____
A. You'd better buy a watch.
B. It's three thirty by my watch.
C. Can you see the clock?
D. It's late I think.
【单选题】
- What do you think of the movie we saw last night?____
A. The actress is bad.
B. Terrific!
C. The theatre is bad.
D. Nobody was there.
【单选题】
___ No, thanks. I'm just looking around. I'll let you know if I want anything.
A. Could you help me?
B. What will you buy?
C. Can I help you?
D. Do you like to look around?
【单选题】
- Hello, Peter. What do you do?____
A. I am fine.
B. I am not sick.
C. I am a student from Bonn University.
D. I came from Bonn University.
【单选题】
-Excuse me; can I have a seat here?___
A. Be hurry.
B. Come on.
C. Yes, please.
D. Do you mind?
【单选题】
- Shall we sit up here on the grass or down there near the water?___
A. I'd rather stay here if you don't mind.
B. Sorry, I don't like neither.
C. Certainly, why not？
D. Yes, we like these two places.
【单选题】
- What do you do on Sunday?___
A. I 'm a teacher.
B. I play football.
C. You are a student.
D. They clean rooms.
