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Optical pickup is one of the kernels of optical storage industry. It is used for all kinds of optical storage systems widely. It consists of optical collimator system, optical focusing system, servo error signal generating system and the enforce element of servo system .

中文题名DVD光学读取头关键技术研究副题名外文题名 On key technology of DVD pickup 论文作者王继平导师阮玉学科专业物理电子学研究领域\研究方向学位级别博士学位授予单位华中科技大学学位授予日期2003 论文页码总数173页关键词DVD 光学读取头光盘光存储馆藏号BSLW /2003 /TQ597 /2 光学读取头是光存储产业的核心器件，它广泛应用于各类光存储设备中。

Because the carbonyl in its structure is with strongly absorb-electron effect, so it is a kind of non-proton polarity solvent with high boiling point, high flash point and low melting point, use conveniently for many processing operation such as filtration, distillation, solvent extraction, and so on; it is with very low toxicity, so the harm to human body is inappreciable, and reduce the environment pollution; due to its very strong dissolvability, it can dissolve organic matter, inorganic matter, resin, polymer, etc., and activate all kinds of reagent, mix to dissolve the other high boiling point solvents; it is with very good stability, it is stable under the hot strong alkali and acidity condition, it is with water-resistance and light, oxygen stability.

246℃ m.p：—20℃闪点121℃ flash point： 121℃分子式：C6H12N2O molecular formula： C6H12N2O 分子量128.18 molecular weight： 128.18 二、DMPU的化学性质 Chemical character of DMPU 其结构中由于羰基具有强烈的吸电子效应，因而它是一种非质子的极性溶剂，具有高沸点、高闪点、低熔点，在过滤、蒸馏、溶剂萃取等工艺操作中使用方便；毒性极低，对人体危害微不足道，也减少了对环境的污染；由于它具有极强的溶解性，能溶解有机物、无机物、树脂、聚合物等，并对各种试剂具有活化性质，还能与其它高沸点溶剂混溶；具有极好的稳定性，在热的强碱和酸性条件下都很稳定，还具有耐水性及对光、氧的稳定性。

Fire is significant among disasters in urban area. The occuring frequency of fire is the highest among all kinds of disasters, and the loss due to fire is about five times of that due to earthquake. At the present, the tasks such as searching fire control information, disposing alarm telephones and make dispatch, are still accomplished in manual manner domestically. Current commanding system of fire fighting drops behind the development of cities, so that the setout time of fire companies is delayed.

中文题名城市消防指挥系统中的GIS和虚拟现实应用技术副题名外文题名 The application technology of GIS and VR in commanding system of fire fighting for urban area 论文作者许云导师任爱珠教授学科专业防灾减灾工程及防护工程研究领域\研究方向学位级别博士学位授予单位清华大学学位授予日期2002 论文页码总数115页关键词地理信息系统虚拟现实消防指挥系统火灾馆藏号BSLW /2003 /TU998.1 /4 火灾是城市灾害中的重要灾种，其发生频度居各灾种之首，造成的直接损失约为地震的五倍。

Office supplies various types of pens and pencils of various types of matching ball-point pen refill gel of various types of pens of various types of pen brush the all kinds of various types of ink-type highlighter pen whiteboard marker pens of various types of scissors / knife Stapler all kinds of machines of various types of needle / folder of various types of adhesive tape to measure various types of altered supplies all types of goods calculators of various types of folder / information booklets /áall kinds of books / account page / documentation of various types of binding machine paper / printing paper /àall kinds of soft copy / hard copy of notes / notices affixed / Tags Time and Attendance Machine and Des Commodities closure shredder machine supplies of office equipment and documents, cards and accessories

办公用品各类笔以及配套笔芯各类铅笔各类圆珠笔各类中性笔各类签字笔各类钢笔各类毛笔各类墨水各类荧光笔各类白板笔各类记号笔各类剪刀/美工刀各类钉书机各类打孔机各类针/夹各类胶水各类胶带各类涂改用品各类量度用品各类计算器各类文件夹/资料册/名片册各类帐簿/帐页/单据各类装订机各类复写纸/打印纸/相片纸各类软抄本/硬抄本便条/告示贴/标签考勤机及辅品碎纸机封塑机办公设备及耗材证件卡及配件

And own detecting equipment of all kinds all in readiness, annual output of 5 million pieces of screw whorl utensils, more than 300 kind industry sewing parts , the part product have partiality axis , eccentric cam , Ya Cha , connecting rod , heterotype document , axle sleeve , archives circle kind of all kinds of all kinds etc.

并拥有各类齐全的检测设备，年产螺钉旋具500万件，工业缝纫零件三百多种，零件产品主要有偏心轴、偏心凸轮、各类牙叉、连杆、各类异型件、轴套、档圈类等。

Sichuan Provincial Foreign Trade Metals and Minerals Import and Export limited liability company mainly engaged in technology transfer and production of complete sets of equipment and raw materials in bulk import and export business, operating the main products are: thermal power generation equipment, hydro-electric power equipment, power transmission equipment, environmental equipment, water treatment Equipment, general machinery, light industrial machinery, construction machinery, grain, oil, food machinery, transport machinery, plastics machinery, chemical machinery, packaging machinery, machine tools, machine tools, measuring tool cutting tools, hand tools, farm tools, rubber processing equipment, telecommunications equipment, system Sugar equipment, compressed air equipment, geological drilling equipment, ceramic equipment, railroad equipment, rolling stock, chemical equipment, industrial Li, teaching equipment, communications equipment, glass equipment, communication cables, power cables, all kinds of special light bulbs, all kinds of Electronic components, all kinds of hardware, all kinds of aluminum, profiles, steel, pig iron, iron alloy, nonferrous metals, ferrous metals, non-metallic mineral products and chemical raw materials, the company is now working with various world-renowned brand manufacturers and agents There is a close business contacts at the same time the company has also developed international financial institutions, loans and government bonds, and other related businesses bidding, so far, I Division in loans from the World Bank, Asian Bank loans in the tender have been repeatedly successful.

四川省外贸五金矿产进出口有限责任公司主要从事技术引进，成套设备和大宗生产原材料的进出口业务，经营的主要产品有：火力发电设备、水力发电设备、输变电设备、环保设备、水处理设备、通用机械、轻工机械、建筑施工机械、粮油食品机械、运输机械、塑料机械、化工机械、包装机械、机床、机床工具、量具刃具、手工工具、农具、橡胶加工设备、邮电设备、制糖设备、空气压缩设备、地质钻探设备、搪瓷设备、铁道设备、机车车辆、化工仪器、工业黧器、示教仪器、通讯仪器、玻璃仪器、通信电缆、电力电缆、各种特种灯泡、各种电子元件、各种小五金、各种铝材、型材、钢材、生铁、铁合金、有色金属、黑色金属、非金属矿产品和化工原料等，公司现与多个世界著名品牌的生产厂和代理商有着密切的业务往来；同时公司还开展国际金融机构贷款和国债项目等相关的招投标业务，迄今为止，我司在世界银行贷款、亚洲银行贷款等的招标中曾先后多次中标。

Company's main scope: laminator Center, over the plastic film Center, Cold Laminator Center, Cold laminating film, binding machine, binding equipment, business cards, red card machines, PVC red card machines, tailor-made all kinds of red card machines, Hand-type cutting devices such as desktop, Humidity Cabinets, moisture-proof cabinets, paper shredders, financial binding machine, cash register, attendance machine, fingerprint machines, punching machines, chamfering device, coder, stamping machine, bronzing film, pressure mark machine, sealing machine, laminating machine, tailor-made all kinds of coating, point notes Detector, badge machine, badge supplies, Observing heat press machine, baking cup machine, oven machine, baking cap machine, thermal transfer paper, sublimation ink, afterburner brand corns machine, afterburner brand manual electric chamfering device, cloud wide brand heavy-duty cutting knives, Fang Ling series hob, KW Series Stapler drilling machine, all kinds of Specifications shrink film, film projection radius of cards, laser film, color ink-jet film, PVC-free laminate materials, PVC ink, all kinds of leather and transparent leather badge, slings and hanging folders.

公司主营范围：过塑机总汇，过塑胶片总汇，冷裱机总汇，冷裱膜，装订机，装订器材，名片冲卡机，PVC冲卡机，订做各种规格的冲卡机，台式手式裁像器，防潮箱，防潮柜，碎纸机，财务装订机，收银机，考勤机，指纹机，打孔机，倒角器，打码机，烫金机，烫金膜，压痕机，封口机，覆膜机，订做各种规格的覆膜，点钞验钞机，胸章机，胸章耗材，五合一烫画机，烤杯机，烤盘机，烤帽机，热转印纸，热转印墨水，加力牌鸡眼机，加力牌手动电动倒角器，云广牌重型切纸刀，方菱系列滚刀，KW系列订书机打孔机，各种规格收缩膜，方圆牌投影胶片，激光胶片，彩色喷墨胶片，PVC免层压材料，PVC墨水，各种真皮仿皮透明胸卡，吊绳，吊夹。

The annual output of all kinds of leisure motorcycle is 100,000 sets; all kinds of household generator is 50,000 sets; all kinds of automobile chair and adjuster is 3,500,000 sets; all kinds of automobile water bump solid pulley, steering pump solid pulley, fan solid pulley, air conditioning solid pulley and cropper solid pulley is 6,000,000 sets; all kinds of motorcycle fuel tank and carriage is 500,000 sets.

各种休闲摩托车生产能力为10万辆、各种家用发电机生产能力5万台、各种汽椅及调节器350万、各种汽车水泵带轮、转向泵带轮、风扇带轮及空调机带轮、割草机带轮等带轮的年生产能力为600万只、各种摩托车燃油箱、摩托车车架年生产能力为50万套。

The hotel［hEu5tel］ offers［5CfEz］ its guests［gests］ a wide variety［vE5rBiEti］ of amusement.

济南晚上有各种各样的娱乐活动。（all kinds of各种各样的

The company's long-term recovery of various waste a lot of tungsten steel, high-speed steel and tungsten wire cutter, a high proportion of alloys, tungsten alloy trim all kinds of waste, all kinds of waste NC knives, all kinds of waste-cutter, drill PCB waste, all kinds of waste legislation Cutter, Cutter saw waste, scrapped gongs knife, anvil, spent V-CUT knife, trim line cutting, waste Drawing Die, die stamping waste, waste-cold pier, tungsten steel powder, such as tungsten steel, high-speed Waste steel tools, I acquired approach is simple, direct cash settlement is the direct use, price guarantees than others, the long-term-oriented, mold factory, electronic factories, metal processing, machinery processing plant, plant-embryo, electroplating factory , Regardless of the manufacturer, sale, processing, as long as the tungsten-cobalt alloy scrap a large number of recycling, such as your company has goods or in other units can be linked to the sources, welcomed the intermediaries, will be Chongchou!

本公司长期大量回收各种废钨钢，高速钢，钨绞丝，高比重合金，各种废钨合金边角料，各种废数控刀具，各种废铣刀片，废PCB钻头，各种废立铣刀，废锯片铣刀，报废锣刀，顶锤，废V-CUT刀，线切割边角料，废拉丝模，废冲压模，废冷墩模，钨钢粉末，等各种钨钢，高速钢废工具，我公司收购办法简便，直接现金结算，是直接使用，所以价格保证比他人高，长期面向各，模具厂，电子厂，五金加工厂，机械加工厂，模胚厂，电镀厂，不分生产厂家，销售，加工，只要是钨钴合金废料，大量回收，如贵公司有货或在其他单位能联系到货源，欢迎中介，定重酬！

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。