精密的

The unlifting pressure process in solid abrasive doublesides lapping has been studied through the mathmatics model established in this paper.

针对固着磨料研磨的特点，通过所建立的数学模型，对固着磨料双面研磨过程中压力的变化进行研究，并对研磨过程的压力实施进行优化，从而找到在研磨过程中最佳的施压方法，以达到对硅晶片、玻璃硬盘基片等进行高速精密和超精密加工的目的。

Then in another tower, of which the height was 1.6m and the inner diameter was 20mm, the pentanol mixture was exactly rectified. The influence factors on separation effect, for example, the material concentration, evaporation velocity, circumfluence rate.etc, were studied and a set of separation system about salt-out -exactitude rectify was upbuilt. The result showed: when the material concentration was 60%, we got our product, 2-methyl-1-butanol, with the concentration over 99% and the top quality recovery over 82.7% which would increase as the material concentration did.

在高1.6m，内径为20rnm的精馏塔内，对戊醇混合物进行精密精馏，研究了原料浓度、蒸发速率、回流比等因素对分离效果的影响，建立了一套盐析-精密精馏的分离体系，结果表明：原料中2-甲基-1-丁醇浓度60％时，得到的2-甲基-1-丁醇产品浓度在99％以上，最高收率达82.7％以上，且随着原料浓度的增加而进一步增大。

Welcome to PRS , a leader in engineering, manufacture, service and support of high precision cylindrical cross roller bearing, taper cross roller bearing, wire race bearing, thin section ball bearing, eccentric combined bearing used in print machine, slewing rings etc from ID 100mm to 5500mm. PRS uses CAD, PDM, etc software and ERP, CRM, PROE, etc Management systems to better meet more expanding needs in recent years. At PRS, we realized that today competitive demand more than just products. That why, our engineers would only take half busines day to provide a primary drawing and answer variety of questions according to customers' requirements. In addition, we offer a variety of technical development and design in standard or nonstandard products. Our product sales engineers will provide in-time and correct price reply service within one hour for the worldwide customers.

我们拥有强大的技术开发能力，能够设计、生产各种标准和非标准产品，这种强大的技术开发能力造就了我们在精密圆柱交叉滚子轴承、精密圆锥交叉滚子轴承、钢丝跑道轴承、等截面薄壁球轴承、印刷机专用高精度偏心组合轴承、回转支承及其他产品领域中一直处于国内领先地位；近年来我们使用CAD、PDM、PROE等产品设计辅助工具和ERP、CRM等管理系统，不断提高我们工作的质量和效率，工程技术人员可以在半个工作日内为用户提供初步的设计方案，能够随时为用户解决各种疑难问题；同时我们产品销售工程师最快能够在1个小时内对全球用户询求的常规产品作出准确的价格回复。

As a most essential driving part, gear is widely used in all kinds of machines in many important industrial fields.

齿轮是各类机械中应用极为广泛的重要传动零件，采用以净形或近净形为目标的精密锻造成形工艺生产齿轮件，适应高效、精密、绿色清洁的21世纪先进制造技术的发展趋势，成为未来齿轮加工变革的主要方法之一。

Lens before the Ad Hoc smoke dust protection glass, a result of streamlined shape and elegant design, the most widely used in precision manufacturing, electronics industry, circuit board welding, assembly line-chip packaging and testing; precision manufacturing equipment, assistive devices as products online for observation, measurement, testing and analysis; aquaculture industry in crab, shrimp nursery observation, parasite control, insect pests and plant anatomy; textile fiber structure observation, the surface of raw materials and cotton fabric testing; traces of science instruments , notes contrast the identification, identification of archaeological heritage purposes.

物镜前特设灰尘烟雾保护玻璃，外形因流线型设计而美观大方，最广泛的应用于精密制造、电子工业、线路板焊接、芯片集成封装流水线组装和检测；精密制造业中作为设备的辅助装置用于产品的在线观察、测量、检验和分析；养殖业中蟹、虾育苗观察、寄生虫防治、昆虫植物病虫害的解剖；纺织业纤维结构观察、原料和棉毛织物表面检验；痕迹学中的文书、纸币对比辨别、考古学的文物鉴定等用途。

Ningbo bit CNC Machinery Co., Ltd. is a Sino-foreign joint ventures, professional design, production, marketing high-speed high-speed precision punch and spark machine series, the company since its inception has always been the "honest to the letter, service is supreme" the objective, we use the most stringent quality management system to provide the most complete service to ensure our customers satisfaction with the biggest ideas, ongoing commitment to innovative research, especially the introduction of Japan, Taiwan's advanced technology, the development of a new generation of high-quality precision punch and spark machine series.

宁波比特数控机械有限公司是中外合资企业，专业设计、制作、销售高速·高速精密冲床和火花机系列，公司自成立以来始终贯彻&以诚至信、服务至上&的宗旨，我们用最严谨的品质管理体系来提供最完善的服务，秉承确保客户最大的满意度理念，不断致力于创新研究，特引进日本、台湾的先进技术，开发新一代高品质精密冲床和火花机系列。

The Examination of the Sine Bar for the Petroleum Thread Gage;2. The sine bar is a practical precision measuring implement which can measure indirectly or a machining tool for the precision angle by the sine principle.

正弦规是利用正弦函数原理对精密角度进行间接测量或加工的一种常用的精密量具或工具，常用于测量内、外锥体的锥角及外锥体的大小端直径，也用于测量角度块的角度、孔中心线与平面之间的夹角。

Considering the problems of spurgear precise plastic forming, such as high deformation resistance, poor flowability and especial hardness to fill cant of gear, technological plan was developed based on precise plastic forming technique, successive control principle and consecutive local deformation theory. Moreover, structures of the rolling preform die and the die with up and down wellrounded forcer for stamping-extrusion and bulge-extrusion combining forming were designed too.

因此本文的主要研究内容和结果如下：本文以某种直齿轮：模数m＝2，齿数z＝20，压力角α＝200，变位系数x＝0为对象，针对直齿轮精密塑性成形变形抗力大，流动性差，特别是成形中齿轮角隅部分更加难以充满问题，基于精密塑性成形技术、逐次控制原理以及连续局部变形原理提出了&直齿轮滚轧制坯－镦挤、胀挤复合精成形&的工艺方案，设计了滚轧制坯的模具结构和上下冲头带圆角的镦挤、胀挤复合精成形的模具结构。

At present, as the production level is advanced with the technology of astronavigation and continuous development of aviation, higher accuracy and efficiency in measurement are demanded to meet them. Therefore, studies on the stiffness measuring of spring tubes, typical plastic parts, is of great importance in enhancing strength of national defense.

随着制造技术水平的提高以及航空航天技术的不断发展，对精密弹性元件的加工精度和加工效率提出了更高的要求，所以研究以弹簧管为代表的该类弹性元件的刚度精密测量技术对增强国防实力有着重要意义。

The thesis studies several key issues on sampling computation and digital waveform synthesis in electrical measurements thoroughly, and applies some of the results into the precision measurement of VLF voltage.

本文对精密电测中的采样计算及数字波形合成的几个关键问题进行了深入细致的理论研究，并将有关的结果应用于超低频电压的精密测量中。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。