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Wire electrode based on the trajectory of the different forms of control, WEDM can be divided into three types: one is shaped by the imitation controlled cutting in line in advance and work to create the same shape by mold, when processing the workpiece at the same time rough and on the mold clamping in the machine tool table, in the process of cutting wire electrode tightly against the mold on the edge of the track for the mobile, thus cutting out and die on the same shape and precision to the workpiece; another One is the electro-optical tracking control, to carry out the cutting line, before the basis of certain parts to enlarge the proportion of drawings depicts an electro-optical tracking map-processing machines will be placed in design stage of electro-optical tracking, tracking platform Photoelectric first line of graphics has always been to follow the track of the Mexican campaign, and then through the use of electrical, mechanical linkage to control the machine tool table, together with the workpiece so相似形wire electrode relative movement, thus cutting out the same shape and design to the workpiece; again a digital control, the use of advanced automatic control of digital technology-driven machine tool in accordance with the pre-processing parameters according to the workpiece geometry pre-processing procedures for the preparation of a good CNC auto-complete processing, the production does not require appearance on board the need to map to enlarge map of the previous two form of control has a higher machining accuracy and a broad range of applications, both at home and abroad more than 95% have adopted WEDM NC.

根据对电极丝运动轨迹的控制形式不同，电火花线切割机床又可分为三种：一种是靠模仿形控制，其在进行线切割加工前，预先制造出与工件形状相同的靠模，加工时把工件毛坯和靠模同时装夹在机床工作台上，在切割过程中电极丝紧紧地贴着靠模边缘作轨迹移动，从而切割出与靠模形状和精度相同的工件来；另一种是光电跟踪控制，其在进行线切割加工前，先根据零件图样按一定放大比例描绘出一张光电跟踪图，加工时将图样置于机床的光电跟踪台上，跟踪台上的光电头始终追随墨线图形的轨迹运动，再借助于电气、机械的联动，控制机床工作台连同工件相对电极丝做相似形的运动，从而切割出与图样形状相同的工件来；再一种是数字程序控制，采用先进的数字化自动控制技术，驱动机床按照加工前根据工件几何形状参数预先编制好的数控加工程序自动完成加工，不需要制作靠模样板也无需绘制放大图，比前面两种控制形式具有更高的加工精度和广阔的应用范围，目前国内外95%以上的电火花线切割机床都已采用数控化。切割属电加工范畴，是由前苏联人发明的，我国是第一个用于工业生产的国家，当时由复但大学和苏州长风机械厂合作生产的这是最早的机型叫复旦型，我们国内在此基础上发展了快走丝系统。欧美和日本发展了慢走系统LS

After this text introduced and will imitate the audio frequency signal processing as numerical signal after red shoot outside, the numerical signal that will receive again solution adjust after the audio frequency power enlarger enlarge restore in order to imitate the speech signal, shot the electric circuit outside analyzed to design the audio frequency signal before collecting the electric circuit, signal placed the big electric circuit, frequency to make the electric circuit, red, red circumscribed to accept the electric circuit,, frequency the solution adjusted the electric circuit and audio frequencies to enlarge the electric circuit etc.

本文介绍了将模拟音频信号处理为数字信号后经红外发射，再将接收到的数字信号解调后经音频功率放大器放大后还原为模拟语音信号，在分析设计了音频信号采集电路、信号前置放大电路、频率调制电路、红外发射电路、红外接收电路、、频率解调电路以及音频放大电路等各组成部分。

Enlarge effection of the mixture of. PB and Beta-cypermethrin accord with equation y =-0.0156x2 + O.I623x + 1.2098(r = 0.8862). Other several proportion of insecticide with PB is 5:1, Tetramethrin's enlarge effection is 2.51 times The Permethrin is 1.40 times, D-trans allethrin is 0.50 times, D-prallethein is 1.67 times ,80% DDV milk is 1.38 times.

PB对高效氯氰菊酯的增效作用符合方程y=-0.0156x~2+0.1623x+1.2098(r=0.8862)，以PB和其它几种杀虫剂的比例为5：1时，对敏感家蝇种群成虫的毒力增效倍数为胺菊酯2.51倍、氯菊酯1.40倍、右旋反式丙烯菊酯0.50倍、右旋丙炔菊酯1.67倍、80％DDV乳油1.38倍，各杀虫剂与PB混配均表现为相加作用。

The end of law is not to abolish or restrain, but to preserve and enlarge freedom

法律的目的不是废除或限制自由，而是保护和扩大自由。

During flying, the tethered aerostat can carry communications equipments (such as base station at high altitude) and enlarge communications coverage so as to carry out emergent communications in disaster areas.

可搭载通信设备升空，提高通信覆盖范围，实现灾区应急通信；也可搭载光学成像设备，在社会重大活动中提供公共安全监视功能，是理想的应急通信和监视平台。

To study and know English affixation well is one of the most efficient ways to enlarge vocabulary rapidly, reinforce memory of words that have been learnt, grasp meanings of words further, and use words in suitable situations.

我们在英语学习中，要迅速扩大词汇量、巩固已学的词汇、加深理解词义、善于运用词语，学习和了解英语的词缀法是最有效的途径之一。

On May 12, through the construction that broad ginseng builds unit last a period of time more than one year, company of golden plain group the key is energy-saving 2008 the environmental protection that decrease a platoon tackles key problem project " contain enlarge of station of sewage disposal of heavy metal ion to be able to transform a project " affusion trial run is successful, each technology index achieved production to design craft requirement, the mark is worn the company reclaims in sewage processing use on the one pace that stepped materiality.

5月12日，经过广大参建单位历时一年多的建设，金川集团公司2008年重点节能减排环保攻关项目"含重金属离子污水处理(通过物化方法去除水中一些物质的过程)站扩能改造工程"注水试车成功，各项技术指标达到了生产设计工艺要求，标志着公司在污水治理回收利用上迈出了实质性的一步。内容来自www.ch-water.com

International trade activities enlarge the scale of production and consumption, and aggravate this deterioration.

国际贸易活动的开展扩大了生产和消费活动规模，加剧了环境退化。

The results show that the shape of meniscus is non-homogeneous because of the structure of the rectangular mold, and the height of meniscus will enlarge as increasing the power, and at the same time the meniscus fluctuate aggregately. The coil should be placed near the top of the mold and the initial free surface level should be placed in the middle of the coil in practice.

结果表明：由于矩形电磁软接触结晶器本身的结构限制，其弯月面沿周向上的分布具有不均匀性；随电源功率增大，弯月面高度增大，同时波动加剧；实际生产中线圈应尽量靠近结晶器口部位置安装，有利于提高弯月面高度和增强弯月面稳定性；浇注过程中，应该使浇注液面尽可能的控制在线圈中心偏上位置；当电源频率增大时，应该同时适当的提高电流来保证软接触效果。

This is quite useful: one may safely enlarge the field ''K'', for instance to get an algebraically closed field; Jordan forms can then be computed over the large field and can be used to determine whether the given matrices are similar over the small field.

不是所有的矩阵都可以对角化，但至少在复数域内，所有的矩阵都相似于一些被称为

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。