相关试题
【判断题】
极限偏差是允许尺寸变化的两个极限值，它以实际尺寸为基数来确定。
【判断题】
|32.配合公差等于互相配合的孔公差与轴公差之差。
【判断题】
激动轴承的外环与箱体孔的配合应尽量采用基孔制。
【判断题】
实际形状对理想形状的偏离最称为位置误差。
【判断题】
位置公差就是实际位置对理想位置的允许变动量。
【判断题】
表面结构一般受加工方法或其他因素影响。
【判断题】
在曲柄摇杆机构中，传动角越大。机械的传力性能越好。
【判断题】
行程速比系数K表示机构的急回特性，K值越大，急回特性就越明显。
【判断题】
车床主轴箱中的滑移齿轮不属于变向机构。
【判断题】
等加速、等减速的凸轮机构，应用于凸轮转速较高和从动杆质量较大的场合。
【判断题】
轮系中加入惰轮，可改变从动轮的旋转方向，并改变主、从动轮的传动比大小。
【判断题】
所有轮系的齿轮轴的几何位置都是固定的。
【判断题】
在行星轮系中，行星轮的轴线是转动的，但只能自转而不能公转。
【判断题】
两带轮直径之差越大，则包角越小，所以传动比不宜过小。
【判断题】
V带传动的张紧轮应尽量靠近大带轮的一边。
【判断题】
在外径千分尺螺旋传动结构中，螺母不动，丝杆回转并做直线运动。
【判断题】
在螺旋传动中，螺杆与螺母之间只有滑动摩擦。
【判断题】
所有的螺旋传动都是效率较低的，因为它属于滑动摩擦。
【判断题】
蜗杆传动适用于传动比大而只需传递较小功率的机器中。
【判断题】
蜗杆传动与齿轮传动一样，能保证传动比的准确性。
【判断题】
在链传动中，当链轮转速越高、链节距越大时，动载荷就越小。
【判断题】
渐开线上各点的曲率半径是变化的，离基圆越远其曲率半径越小。
【判断题】
在制造变位齿轮时，一般都是把大齿轮作为变位齿轮的。
【判断题】
齿轮传动的传递功率范围较小，但效率较高。
【判断题】
标准直齿圆柱齿轮的分度圆直径与齿数无关。
【判断题】
螺纹连接中，螺钉或螺母的螺距一般采用细牙螺纹。
【判断题】
压强是液体在静止状态下单位面积上所受到的作用力。
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How much is this necklace?___
A. It's very nice.
B. It's a birthday present from my parents.
C. It costs fifty pounds.
D. It's a bargain.
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How can I get to the cinema?___
A. It's very far.
B. Yes, there is a cinema near here.
C. It's well known.
D. Go down this street and turn left.
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What's the matter, John?___
A. I failed my French test
B. It doesn't matter.
C. Nothing's wrong with him.
D. I don't think I can.
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What are you majoring in?___
A. In a university.
B. Very hard.
C. Mathematics.
D. At nine in the morning.
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Are you going on holiday for a long time?___
A. It was a long time.
B. Two weeks ago.
C. No. Only a couple of days.
D. Not long time ago.
【单选题】
Is Mary there?___
A. Speaking.
B. I'm not Mary.
C. Who are you?
D. Mary is well today.
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What day is today?___
A. It's March 6.
B. It's a fine day today.
C. It's March.
D. It's Monday.
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Is that seat taken?___
A. Please don't worry.
B. I don't think so.
C. Why not?
D. It's very nice.
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Thank you for calling.___
A. Don’t mention it.
B. That's fine.
C. Nice talking to you.
D. Call back again.
【单选题】
How are you getting on today?___
A. Very well.
B. How do you do?
C. I'm a doctor.
D. Nice to have known you.
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How's your family?___
A. Thanks all the same.
B. Thanks for calling.
C. Not too bad.
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- How is it that you are late for class again?___
A. Because I missed the bus
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C. Yes, it is quite wrong
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- Excuse me. Could you spare me a few minutes? - ___
A. Of course.
B. Of course not.
C. I am sorry to hear that.D.Yes. I'm busy now.
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- It's very thoughtful of you to give me a ride. ___
A. It's my pleasure.
B. Take it easy.
C. Sure.
D. Never mind.
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- This is heavy! What's in it? ___
A. I think you don't like it.
B. My new computer. I just bought it.
C. I'm glad you're here.
D. Are you really interested in it?
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___ I'd like to place an order please.
A. Can I help you?
B. I can help you.
C. What are you doing?
D. Why are you doing?
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- Do you know the girl over there?___
A. How can I know?
B. Yes, I remember it now.
C. It's Sam, my teacher's daughter.
D. She is a good girl.
【单选题】
- Shall we go out for dinner tonight?____
A. No, you can't.
B. Yes, please.
C. Thank you, I don't want to.
D. Sorry, I have a report to finish.
【单选题】
- I think the reference book（参考书）is very helpful.____
A. Good idea.
B. So do I.
C. With pleasure.
D. No problem.
【单选题】
- I wish you success in your career.____
A. You are welcome.
B. I think so.
C. Yes, please.
D. The same to you.
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- Would you like to come over tonight?____
A. Yes, last night.
B. Yes, over there.
C. Sure, I'd love to.
D. Yeah, I liked it too.
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- How do I transfer calls? ____
A. Do as you like.
B. It is a bit difficult.
C. Let me show you.
D. Not at all.
【单选题】
- Thanks for inviting me, John, but I've already made other plans. ____. Maybe another time.
A. I hope you enjoy it
B. That's good
C. Oh! I'm sorry to hear that
D. Great! I really had a good time
【单选题】
- Thanks for the lovely party and the delicious food. ____
A. No, thanks.
B. Never mind.
C. Thank you for coming.D.That's all right.
【单选题】
- Why didn't you tell me? ____
A. Sorry, I forgot.
B. I'm sorry you should wait.
C. I don't know.
D. I'd love to.
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- What do you plan to do after the exam? ____ How about you?
A. I hate taking exams.
B. I like making plans.
C. Nothing special.
D. I've changed my mind.
【单选题】
- Tom told me that you collect stamps. ____
A. What do you mean?
B. I don't think so.
C. Why did he tell you?
D. Yes, I do. Do you?
【单选题】
- This is a challenging job. Who wants it？____
A. I'll take it.
B. It's a good idea.
C. You bet!
D. No sweat!
【单选题】
- I'm taking my driving test tomorrow. ___!
A. Cheers
B. Good luck
C. Come on
D. Congratulations
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- ABC Company, may I help you? ____
A. I am Jack. May I speak to Miss Jenny?
B. This is Jack speaking. May I speak to Miss Jenny?
C. This is Jack speaking. Can I find Miss Jenny?
D. I am Jack. Can I find Miss Jenny?
【单选题】
- You have won the football game. Congratulations! ____
A. We are really lucky.
B. No one else could do it.
C. Oh, not really.
D. It's nice of you to say so.
【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.
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- 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.
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- 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.
