英语ppt演 讲稿(精选多篇)

-精选财经经济类资料- -最新财经经济资料-感谢阅读- 1 英语 ppt 演讲稿( 精选多篇) 吉他唱歌 then,i am going to share the experience of learning guitar and singing songs.to be honest ,i am not good at either of them, i just like them. singing can be used to relieve my fatigues and can help me improve my accent. practicing guitar making me happy when i am sad. my hobbies refer to music, it said that singing along with music or dancing to rhythm can make people clever. i am always singing at home to share each others joys and sorrow in our life and to learn many songs. 泼水节 it goes without saying that there are many different kinds of -精选财经经济类资料- -最新财经经济资料-感谢阅读- 2 activitiesand they can not only broaden our minds but also add more fun to our life.for example , thailand water splashing festival ,it represents thailand thai new year, the water-splashing festival is in mid-april and lasts three to five days. water is the most precious thing to the tai people,they believe the holy water make you get rid of bad luck,the tai peoples wish for your good fortune and happiness sincerely. 印尼美食节 in the indonesian food festival , we satisfy our taste buds,also, we feastedour eyes on the he traditional dances, songs and music. 风雅中华 and the “feng ya zhong hua” is china traditional culturalquiz. we had a chance that enabled our to presen our knowledge and practice ourcooperative learning skills. 五缘水乡 it is a wetland park.where we can see manyblack swans . it is surrounded by verdant trees on -精选财经经济类资料- -最新财经经济资料-感谢阅读- 3 in its the lakeside and intoxicates tens ofthousands of people arms with their wonderful charm and its radiant and enchanting scenery in lake water.you can learn much during your travel about the geography, biology, and history of the places you visit. 小结 no matter how well educated you are, there is always a lot for you to learn through travelling. the knowledge acquired from travel, as you will have found in your life, is no less valuable than that from any influential reference book. to make a better city, planners aimed at creating a city in which the insalubrious environment and social structure would be defeated by a reordering of physical and social arrangements, so that all the citizens could attain the benefits of beauty, community, and democracy. in harveys opinion, the -精选财经经济类资料- -最新财经经济资料-感谢阅读- 4 better city should confront on the postmodernist challenge to political economy, and deal with environmental sustainable. however i think green buildings could make good cities, and also citizens will have a best quality of life. according to the world green building councils definition, “to significantly reduce or eliminate the negative impact of buildings on the environment and on the building occupants, green building design and construction practices address: sustainable site planning, safeguarding water and water efficiency, energy efficiency, conservation of materials and resources, and indoor environmental quality.”the green building, which is sustainable in the built environment, can reduce environmental impact but also provide better buildings. the technologies -精选财经经济类资料- -最新财经经济资料-感谢阅读- 5 associated with green buildings include: -energy conservation -water conservation -material selection -use of renewable materials -occupant health and indoor environment quality -site ecology -recycling the green building can be residential, commercial, retail and industrial buildings. for example, the green building uses water-mining plant to recycle water on toilet flushing, watering the garden, and washing cars. the building also uses phase-change materials for cooling, automatic night-purge windows, wavy concrete ceilings, which saves a lot of money and become more sustainable. the idea of green and healthy cities is becoming more important nowadays. the better city should be planed for health and -精选财经经济类资料- -最新财经经济资料-感谢阅读- 6 well-being by planners, and they will mainly focus on service facilities, educations. the good city will also need to be safe in community, and make community more walkable, and has an urban design with exquisite streetscape. however the planner keeps developing new ideas of how cities should be changed, therefore the city will become more livable and sustainable in the future. reference: susan s. fainstein, can we make the cities we want? the urban movement richard reed and sara j. wilkinson green building-issues for the valuation process, uiversity of melbourne to make a better city, planners aimed at creating a city in which the insalubrious environment and social structure would be defeated by a reordering of physical and social arrangements, so that all the citizens could -精选财经经济类资料- -最新财经经济资料-感谢阅读- 7 attain the benefits of beauty, community, and democracy. in harveys opinion, the better city should confront on the postmodernist challenge to political economy, and deal with environmental sustainable. however i think green buildings could make good cities, and also citizens will have a best quality of life. according to the world green building councils definition, “to significantly reduce or eliminate the negative impact of buildings on the environment and on the building occupants, green building design and construction practices address: sustainable site planning, safeguarding water and water efficiency, energy efficiency, conservation of materials and resources, and indoor environmental quality.”the green building, which is sustainable in the built environment, can reduce -精选财经经济类资料- -最新财经经济资料-感谢阅读- 8 environmental impact but also provide better buildings. the technologies associated with green buildings include: -energy conservation -water conservation -material selection -use of renewable materials -occupant health and indoor environment quality -site ecology -recycling the green building can be residential, commercial, retail and industrial buildings. for example, the green building uses water-mining plant to recycle water on toilet flushing, watering the garden, and washing cars. the building also uses phase-change materials for cooling, automatic night-purge windows, wavy concrete ceilings, which saves a lot of money and become more sustainable. the idea of green and healthy cities -精选财经经济类资料- -最新财经经济资料-感谢阅读- 9 is becoming more important nowadays. the better city should be planed for health and well-being by planners, and they will mainly focus on service facilities, educations. the good city will also need to be safe in community, and make community more walkable, and has an urban design with exquisite streetscape. however the planner keeps developing new ideas of how cities should be changed, therefore the city will become more livable and sustainable in the future. reference: susan s. fainstein, can we make the cities we want? the urban movement richard reed and sara j. wilkinson green building-issues for the valuation process, uiversity of melbourne 1、lathe 2、value of two yuan of the third series of the rmb the turner 3、a lathe is a machine tool which -精选财经经济类资料- -最新财经经济资料-感谢阅读- 10 rotates the workpiece on its axis to perform various operations such as cutting, sanding, knurling , drilling, or deformation with tools that are applied to the workpiece to create an object which has symmetry about an axis of rotation. 4、history the lathe is an ancient tool, dating at least to ancient egypt and known and used in assyria and ancient greece . the origin of turning dates to around 1300 bc when the ancient egyptians first developed a two-person lathe. ancient rome improved the egyptian design with the addition of a turning bow. in the middle ages a pedal replaced hand-operated turning, the system today is called the “spring pole” lathe. spring pole lathes were in common use into the early 20th century. during the industrial revolution, mechanized power generated by water -精选财经经济类资料- -最新财经经济资料-感谢阅读- 11 wheels or steam engines was transmitted to the lathe via line shafting, between the late 19th and mid-20th centuries, individual electric motors at each lathe replaced line shafting as the power source. beginning in the 1950s, servomechanism were applied to the control of lathes and other machine tools via numerical control, today manually controlled and cnc lathes coexist in the manufacturing industries . 5、description ：parts explanation of the standard components of most lathes: ? bed 床身: usually made of cast iron. provides a heavy rigid frame on which all the main components are mounted. ? ways 床身导轨: inner and outer guide rails that are precision machined parallel to assure accuracy of movement. ? headstock 床头箱，主轴箱 : mounted in a fixed position on the inner -精选财经经济类资料- -最新财经经济资料-感谢阅读- 12 ways, usually at the left end. using a chuck, it rotates the work. ? gearbox 齿轮箱 变速器: inside the headstock, providing multiple speeds with a geometric ratio by moving levers. ? spindle 心轴，主轴: hole through the headstock to which bar stock can be fed, which allows shafts that are up to 2 times the length between lathe centers to be worked on one end at a time. ? chuck 卡盘: 3-jaw or 4-jaw to clamp part being machined. ? chuck: allows the mounting of difficult workpieces that are not round, square or triangular. ? tailstock 尾架: fits on the inner ways of the bed and can slide towards any position the headstock to fit the length of the work piece. an optional taper turning attachment would be mounted to it. -精选财经经济类资料- -最新财经经济资料-感谢阅读- 13 ? tailstock quill 尾架套管 : has a morse taper to hold a lathe center, drill bit or other tool. ? carriage 托架，滑动架: moves on the outer ways. used for mounting and moving most the cutting tools. ? cross slide 横刀架，横拖板，横 溜板: mounted on the traverse slide of the carriage, and uses a handwheel to feed tools into the workpiece. ? tool post 刀架，刀座: to mount tool holders in which the cutting bits are clamped. ? compound rest 复式刀架: mounted to the cross slide, it pivots around the tool post. ? apron 床鞍: attached to the front of the carriage, it has the mechanism and controls for moving the carriage and cross slide. ? feed rod 进给杆: has a keyway, with two reversing pinion gears, either of which can be meshed with the mating -精选财经经济类资料- -最新财经经济资料-感谢阅读- 14 bevel gear to forward or reverse the carriage using a clutch. ? lead screw 丝杠: for cutting threads. ? split nut 开合螺母: when closed around the lead screw, the carriage is driven along by direct drive without using a clutch. ? quick change gearbox 快换齿轮 箱: controls the movement of the carriage using levers. ? steady rest 固定中心架: clamped to the lathe ways, it uses adjustable fingers to contact the workpiece and align it. can be used in place of tailstock or in the middle to support long or unstable parts being machined. ? follow rest 跟刀架 : bolted to the lathe carriage, it uses adjustable fingers to bear against the workpiece opposite the cutting tool to prevent deflection. 69、 description：accessories -精选财经经济类资料- -最新财经经济资料-感谢阅读- 15 three-jaw chuck : self-centering three-jaw chuck and key with one jaw removed and inverted showing the teeth that engage in the scroll plate. the scroll plate is rotated within the chuck body by the key, the scroll engages the teeth on the underside of the jaws which moves the three jaws in unison, to tighten or release the workpiece. four-jaw chuck :independent four- jaw chuck, also known as a universal chuck, with the jaws independently set. the key is used to adjust each jaw separately. collet 弹性夹头 : a collet is a holding devicespecifically, a subtype of chuck that forms a collar around the object to be held and exerts a strong clamping force on the object when it is tightened, usually by means of a tapered outer collar. it may be used to hold a workpiece or a tool. faceplate 花盘: a lathe faceplate is the basic workholding accessory for a -精选财经经济类资料- -最新财经经济资料-感谢阅读- 16 wood or metal turning lathe. it is a circular metal plate which fixes to the end of the lathe spindle. the workpiece is then clamped to the faceplate, typically using t- nuts in slots in the faceplate, or less commonly threaded holes in the faceplate itself. dead center 死顶尖: dead center mounted in the spindle of a lathe and being used to support a workpiece being driven by a carrier setup live center 活顶尖:a live center or revolving center is constructed so that the 60 center runs in its own bearings and is used at the non-driven or tailstock end of a machine. it allows higher turning speeds without the need for separate lubrication , and also greater clamping pressures. lathe carrier 车床鸡心夹头 : a lathe dog, also known as a lathe carrier, is a device that clamps around the workpiece and allows the rotary motion of the -精选财经经济类资料- -最新财经经济资料-感谢阅读- 17 machines spindle to be transmitted to the workpiece. mandrel 心轴: an object used to shape machined work. 10、application lathes are used in woodturning, metalworking, metal spinning, and glass- working. lathes can be used to shape pottery, the best-known design being the potters wheel 陶车. most suitably equipped metalworking lathes can also be used to produce most solids of revolution, plane surfaces and screw threads or helices. ornamental lathes can produce three- dimensional solidsof incredible complexity 11、examples of work produced from a lathe 12、thank you! im very happy to have this opptunity to give you a talk.today,my topic is lathe. i know many of you are familiar -精选财经经济类资料- -最新财经经济资料-感谢阅读- 18 with this topic can you hear me clearly? i think ti would be best to start out by looking at the picture on the screen i would like to talk about first is the definition of the lathe question that is all,thank you very much do you have any questions? please show me your hand. who else? i think we have time for just one more question traditional martial arts are part of chinas outstanding culture and it contains the spirit of the chinesenation-specific values, way of thinking, imagination, which embodies the chinese nations vitality andcreativity, and intelligence are the crystallization of the chinese people, but also a treasure for allmankind civilization. -精选财经经济类资料- -最新财经经济资料-感谢阅读- 19 the origin of chinese martial arts 中国武术的起源 wushu