《工程地质及水文地质》(第三版)期末复习
八年级上学期英语专项练习题
14.You may in Beijing if you want to go to America. A. take one plane B. take two planes C. take three plane D. not take any planes 15. How many planes may you take in Beijing if you want to go to Australia? A. One B. Two C. Three D. Four. VI阅读填词 当你遇到困难时得到过佰生人的帮助和鼓励吗？来看看本文作者是如何因为一个陌生人的帮助而放弃了自杀念头开始新生活的吧。 Several years ago, I became very sad. There was something w with my left eye. At last, the doctors told me that I could never see from that eye again. This was the saddest n for me. At the time, I f so lonely. So I went to my boss(老板)and asked for some help. He told me to go back to work. One night I was waiting for the train. I wanted to jump in front of it. Then a man came and sat down n to me. He turned to me and s .Then he said,“You look like you need a f to talk to .” We sat there for hours just talking like old friends His w were so kind. Then he gave me a wonderful hug (拥抱). I will never f it. Then he went to get on the train. He gave me another of his big smiles and said,“Remember, when you smile, it is because the angels are lifting the corners of your mouth up to heaven(天堂).” I never saw him again. But he will be in my memories(记忆)forever. A smile can o doors and tear down(拆除)walls, You can smile at a s in the street. They will smile back and you will be filled with happiness too. VII.书面表达 中青旅要招收一名导游，你想尝试一下吗？请给中青旅写一封自荐信。 You must: good health good at history and geography like traveling good at spoken English outgoing 9
八年级英语专项训练
八年级英语专项训练集团档案编码：[YTTR-YTPT28-YTNTL98-UYTYNN08]
八年级英语专项训练（二） 命题人：程素红时间:2017-10-20一、完形填空 （1） Last summer, I went to Yunnan on vacation with my family. We 1 four days there. Our first stop was Lugu Lake. I wondered why there was so beautiful a lake in the world. I enjoyed 2 there. We went boating and took quite a few photos. Then we went up to a hill. On the top of the 3 , we got to see something beautiful. I felt like I was in a painting. I thought I would 4 forget the beautiful scenery (风景) there. The next morning we went to Lijiang by bus. It was a long 5 from Lugu Lake to Lijiang. In the afternoon we 6 . After a short break (休息), we went to walk around the town and bought some gifts. Then we decided to try the famous(着名的) Guoqiao Rice Noodles for dinner. They were very 7 and delicious. After dinner we took a walk and enjoyed the old streets and buildings 8 the moon. The summer evening was cool. Our 9 stop was the "spring city Kunming. We visited Dianchi, watched the birds and went to the flower market. We had a really wonderful day. The four-day trip came to a(n) 10 soon. We had to go home. Everything in Yunnan was great. It is a very beautiful and interesting place. I'm sure You'll never regret（懊悔） going on a trip there. ( ( )2.A. staying B. climbing C.skating D.waiting ( ll https://www.wendangku.net/doc/7c978048.html,ke D.painting ( )4.A. always B. sometimes C.often D.never C.jump D.history ( )9.A. first B. second C. third D. fourth （2）
浅谈表面贴装技术的发展与前景
龙源期刊网 https://www.wendangku.net/doc/7c978048.html, 浅谈表面贴装技术的发展与前景 作者：周小平 来源：《读与写·上旬刊》2013年第10期 摘要：从产业自身的发展周期来看，虽然目前中国的SMT产业尚处于发展初期，但是已经呈现出了蓬勃的生机。同时，SMT产业又是一个重要的基础性产业，对于推动中国的电子 信息产业制造业结构调整和产业升级有着重要意义。推动中国SMT产业快速健康发展需要产业上下游各个环节的共同协作。 关键词：表面贴装技术；SMT；发展；前景 中图分类号：G718文献标识码：B文章编号：1672-1578（2013）10-0273-02 表面贴装技术，英文称之为"Surface Mount Technology"，简称SMT，它是将表面贴装元器件贴、焊到印制电路板表面规定位置上的电路装联技术。具体地说，就是首先在印制板电路盘上涂上焊锡膏，再将表面贴装元器件准确地放到涂有焊锡膏的焊盘上，通过加热印制电路板直至焊锡膏熔化，冷却后便实现了元器件与印制板之间的互联。20世纪80年代，SMT生产技术日趋完善，用SMT组装的电子产品具有体积小，性能好、功能全、价位低的优势，故SMT作为新一代电子装联技术，被广泛地应用于航空、航天、通信、计算机、医疗电子、汽车、办公自动化、家用电器等各个领域中。 从产业自身的发展周期来看，虽然目前中国的SMT产业尚处于发展初期，但是已经呈现出了蓬勃的生机。同时，SMT产业又是一个重要的基础性产业，对于推动中国的电子信息产 业制造业结构调整和产业升级有着重要意义。 1.教育培训成为SMT产业的发展的瓶颈 与高速发展的产业相比，我国SMT教育培训明显滞后。例如，由于人才匮乏，从业人员的知识结构和综合能力不适应产业发展要求，近年我国引进的生产线设备虽然很先进，但技术跟不上，水平管理低，有的企业工艺质量上不去，只能做技术含量低的产品；有的陷入压价竞争的恶性循环；有的企业花大笔资金购买的SMT设备一直用不好甚至长期闲置。……这些足以表明由于教育培训滞后，技术人才跟不上，严重制约SMT产业的发展。 对发展髙新技术产业而言，建设形形色色的科技园、开发区，引进成千上万先进成套设备，制定优惠政策招商引资等等都很重要，但都不是关键。关键是人，确切说是人才。企业需要人去管理才能发展，资金需要人去运作才能增值，先进的技术需要人去掌握才能变成财富，先进的设备需要相应技术水平和业务素质的人去管理和操纵才能发挥效益，产品需要人去设计制造才能变成商品，市场需要人去开发才能成为商机。虽然资金、设备都是至关紧要的，但真正的主导者是"人"。高新技术能否提高国家、地区的经济实力，关键是看人的素质。
八年级英语阅读专项训练
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(完整版)人教版八年级英语阅读专项训练卷
育才辅导八年级阅读训练卷 ·A· You are visiting the Eiffel Tower in France, but the next second you are in Thailand. Then, suddenly you may have dinner with Barack Obama in America. But you are not dreaming. This is what might happen in the near future. With the help of virtual reality (VR, 虚拟现实) technology, a lot of changes are taking place in our life. VR is a computer technology that makes an environment and allows users to see and even interact (互动) with it. Just wear a pair of VR glasses joined to your computer and you can experience a lot of things without stepping out of your room. “The most interesting part of VR is that it offers an immersive experience,”said Wang Bing, leader of the Chinese entertainment company Funshow. “That’s why VR movies are popular among users. You become a part of the story.”According to the Report on Chinese VR Users’Behavior last month, over 960,000 people in China have bought VR products and 83.2 percent of them have watched VR movies. VR can also be used in some other ways. It can help to train workers before they have to work in highly dangerous environments. VR also helps patients with acrophobia (恐高症) by making them think they are standing on the top of a tall building. However, VR technology still has a long way to go. Users report feeling sick while wearing VR glasses. Maybe it could take a period of time for VR to be widely used around the world. 1. With a pair of VR ______, users can experience many things at home. A. eyes B. shoes C. glasses D. ears 2. The underlined word “immersive”means ________ in Chinese. A. 惊险刺激的 B.身临其境的 C.虚幻缥缈的 D. 神妙莫测的 3. VR movies are very popular because they make the users _______. A. become much healthier B. stand on the top of a tall building C. become a part of the story D. work in dangerous environments 4. To be widely used, VR glasses must solve the problem of ________. A. making people feel sick B. providing unreal environment C. costing too much money D. taking a long time to join to the computer 5. The best title of the passage may be “_________”. A. Traveling with VR B. VR Changes Our Life C. VR Movies Get Popular D. VR Needs to Be Developed ·B· Expo 2010 is held in Shanghai from May 1 to October 31．People all over the world are looking forward to it．Here are several golden rules on how to best plan your hip． Rule 1：Do your homework
八年级英语专项训练
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SMT表面组装技术知识点总结(考试,讲课均可以用到)
1 PLCC封装引脚是（J）型的 2 锡膏是由（焊料粉末）与（糊状助焊剂）混合组成的 3 铝电解电容器是有级性的电容器 4 表面组装元器件的包装形式主要有四种即（编带，管装，托盘，散装） 5 铝电解电容器之所以有级性是因为正极板上的氧化铝具有（单向导电性） 6在塑料封装的表面组装器件存储和使用中应注意库房室温低于(40)度,相对湿度小于（60%） 7贴装精度有两种误差组成，即（平移误差）和（旋转误差） 8片式矩形电阻器表面通常是（黑色），电容器是（灰色），电感器是（深灰色） 9电子线路焊接的温度通常在（80—300度）之间 10湿度指示卡分为（六圈式）和（三圈式） 11线宽一定时，PCB铜箔厚度越厚人、允许通过的电流越大 12塑料封装表面组装器件开封使用时，观察包装袋内附带的（湿度指示卡） 13 IC的引脚距中心距目前最小是（0.3mm） 14 SOP封装引脚是（翼）型的 15纸基覆铜板基疏松只能冲孔不能钻孔 16焊盘设计时，焊点可靠性主要取决于长度而不是宽度 17锡银铜焊料目前是锡铅焊料的最佳替代品
18通常合金焊料粉末比例占总的重量的(85%-90%)占体积的（50%）左右 19焊粉颗粒直径大小一般控制在（20—75微米） 20按封装材料分有（金属封装，陶瓷封装，塑料封装）等，其中塑料封装易吸潮 21焊料粉颗粒越小，粘度越高 22贴片胶又称（红胶） 23焊膏印刷时，焊膏在版上的运动形式是（滚动） 24带脚垫的QFP器件的脚垫起到（保护引脚）作用 25焊膏黏度的测量采用（黏度计）测量 26 容量超过0.33uf的表面组装元器件通常使用（钽电解电容器） 27 高波峰焊接的后面配置剪腿机用来剪（短元器件）的引脚 28 最常见的双波峰型组合是（紊乱波+宽屏波） 29当PCB进入回流区时，温度迅速上升市焊膏达到熔化状态 30 无铅焊料中（锡）被认为是最好的基础金属 31 铝电解电容器外壳上的深色标记表示（负）级 32 SMT生产线主要由（焊膏印刷机，贴片机，再流焊机和检查设备）组成 33 BGA封装形式中文的意思是（球栅陈列封装） 34 温度对焊膏的强度影响很大，随着温度的升高，年度会明显下降 35 表面组装技术英文缩写（SMT） 36 QFP封装引脚是（翼）型的
表面贴装技术个人简历
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目标地点：广州 期望月薪：面议/月 目标职能：表面贴装技术工程师 工作经验 xx/7—至今：XX有限公司[1年8个月] 所属行业：电子、微电子技术、集成电路 工程部表面贴装技术工程师 1、对SAMSUNGA(CP45NEO,SM320,SM321,SM421)贴片机的编程 调试及维护保养; 2、对全自动印刷机(GKG、DEK、DESEN、SP400II)的调试及维护; 3、对回流焊(HELLER***EXL)的温度调试和炉温跟踪分析; 4、负责SMT生产线质量的管控与改善;制程良率改善; 5、根据生产计划，及时为生产线提供技术支持; 6、按照保养计划和保养标准，带领操作员认真完成设备保养; xx/6—xx/6：XX有限公司[1年] 所属行业：电子、微电子技术、集成电路 技术部 SMT技术员 1、监控设备工艺参数，按照工艺标准，改善产品工艺和品质; 2、监控设备状态，提升设备效率和产能; 3、监控设备抛料状况;并改善、调试及异常处理; 4、按照要求，为生产线人员提供技术培训和考核;
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八年级上册英语专项训练(多套)
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