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When production costs fluctuate and yet,at the same time,selling price can not be adjusted because it is determined by the equilibrium of the entire market,at the aggregate level,where different players have different cost advantages in different products and processes. We show that the variational inequality approach is suitable for dealing with this differential game.

当产品生产成本大幅波动时，产品的销售价格并不能完全的由单独的生产商随意根据自身成本变动调整，因为在寡头垄断市场中，产品的最终售价须由市场的所有参与者共同确定，而不同的厂商在不同的产品与工艺流程中有不同的竞争成本优势。

In this paper, the concept of network security and security structures of OSI and Internet is introduced, and various threats confronting the computer network are also discussed. Several kinds of network information security technologies, including firewall technology, virtual private network, intrusion detection system, data encryption technology, identity authentication and security protocol etc. are also examined. The security of internal network is the biggest problem in the construction of each network. The solution to this problem lies in setting up a firewall. The theory of a firewall and the approach to its actualization is studied. Intrusion detection system, an important part of the computer network security system, has gained extensive attention. IDS monitors the computer and network traffic for intrusion and suspicious activities. It not only detects the intrusion from the extranet hacker, but also the intranet users. The emergence of virtual private network paves the way for realizing secure connection of LAN quickly and at a relatively low cost. The concept, function, key techniques, including the tunnel technology, and the ways to realize VPN are expounded in this paper. Also introduced is the data encrypt network technology, which is called the soul of computer network security, such as digital digest, digital signature, digital certificate, digital encrypt arithmetic and so on. At the same time, the principle and the process of implementing network security by digital certificate and digital signature, the basic principle and characters of security protocols, and finally, three of the security protocols, concerning the security problems in network, IPsec, SLL and SET are analyzed in detail Computer network system should be a system of dynamic defence, both dynamic and static, passive as well as active, and even offensive, combined with management and technology.

本文系统地介绍了网络安全的概念、OSI及Internet的安全体系结构，并讨论了计算机网络面临的各种安全威胁；内部网络的安全问题是每个建网单位面临的最大问题，可以认为防火墙技术是解决网络安全的一个主要手段，本文研究了防火墙的原理及其实现手段；作为一种主动的防御措施，入侵检测系统作为网络系统安全的重要组成部分，得到了广泛的重视，TDS对计算机和网络资源上的恶意使用行为进行识别和响应，不仅检测来自外部的入侵行为，也监督内部用户的未授权活动；虚拟专用网技术的出现，为实现网络间的连接提供了快速安全但又相对便宜的手段，本文较深入的探讨了实现VPN的隧道技术，并对VPN的概念、功能、实现途径、基本构成、关键技术及发展前景等问题进行了全面论述；数据加密技术是网络安全核心技术之一，本文从数据加密算法、数字摘要、数字签名及数字证书等几方面简要介绍了数据加密技术，并分析用数字证书和数字签名实现网络安全的原理和过程；对安全协议的基本原理、主要特点进行了较为深入的研究，并就网络的安全性问题剖析了三种安全协议：IPsec协议、SLL协议和SET协议。

Nor did they render unsound the negotiated purchases of fine businesses at sensible prices. Imagine the cost to us, then, if we had let a fear of unknowns cause us to defer or alter the deployment of capital. Indeed, we have usually made our best purchases when apprehensions about some macro event were at a peak. Fear is the foe of the faddist, but the friend of the fundamentalist.

葛拉罕的投资哲学造成丝毫的损伤，也从没有让以合理的价格买进优良的企业看起来有任何的不妥，想象一下，若是我们因为这些莫名的恐惧而延迟或改变我们运用资金的态度，将会使我们付出多少的代价，事实上，我们通常都是利用某些历史事件发生，悲观气氛到达顶点时，找到最好的进场机会，恐惧虽然是盲从者的敌人，但却是基本面信徒的好朋友。

X shall also have the right, at its option, to purchase or cause to be repurchased some or all of the unsold stock which is not of merchantable quality at the net purchase price paid by DISTRIBUTOR, less a restocking charge of twenty-five (25%) percent, further reduced by an amount which reasonably reflects the cost to X of restoring such merchandise to merchantable condition, the amount of such reduction to be determined by mutual agreement.

第十条应也有权利根据自己的选择，购买或安排将购回的部分或存货，这是销售质量不净购买由经销商付出的代价是，与其说是放养收费25（25 ％）百分比，进一步合理地反映这一数额的费用为X恢复到可销售状态等商品减少，这种减少的数额将根据双方的协议。

For the same core material and at approximately the same current rating, a 10 microhenry inductor will be typically offered at roughly half the size and cost of a 50 microhenry inductor.

例如，用纹波电流驱动一个1A的白光LED (VF≈ 3.5V)，ΔIF需要满足±5%范围内，输入电压12V，频率为500kHz，在电感电流幅度为1.1A时，只能允许使用50mH的电感。

The control system includes detector circuit, protection circuit, control and man-machine interface circuit, which makes full use of DSP resources for high reliability and simplified the construction of system. The fifth section provides system software design, In order to read and maintain easy, a microprogramming modular is adopted. A new control strategy of Fuzzy voltage PWM combined Fuzzy angle control is realized for improving motor s working efficiency. At the same time, it simplify control model of SRM, reduce cost. At last, the result of experiment testify it, the electric machine gain success of simultaneous electrify two phase loop, the timing range is

第五部分为系统软件设计，采用模块化设计，增强了系统的可读性与可维护性；根据SR电机的特点，实现了模糊变角度电压PWM控制，避免了在单纯电压PWM方式下，电机高速时效率下降较大的缺点，也避免了在采用电流斩波与角度位置复合控制时方式转换所带来的弊端，同时也简化了控制，降低了成本；最后给出实验结果，实现了电机的双相稳定运行和良好调速，调速比达40：1。

We have been successful in dozens of production for domestic and foreign enterprises with different specifications, different styles of license plates and license plate mold production equipment (which includes Afghanistan, Mongolia, the European Union, Africa, India, Korea and so on), but also production and sales both at home and abroad License Plate Grade reflective film (with hidden anti-counterfeit labels plate grade reflective film) and a dedicated gilt paper plates paper plates, also known as a dedicated hot plate special transfer paper plates are in today's manufacturing enterprises at home and abroad for the alternative mimeo past produced a new type of production process, where the use of dedicated gilt paper plates (plate special transfer paper vehicle license plate production process, without a few ink and dryer, the process that is time-saving electricity, and has reached the National Vehicle Testing Center of the quality requirements, each small plate using a dedicated gilt paper plates cost reference price of ¤ 1 million.

我们已成功为国内外数十家生产企业提供不同规格、不同样式的车牌模具及车牌生产设备（其中包括阿富汗、蒙古、欧盟、非洲、印度、韩国等等），同时还生产销售国内外车牌级反光膜（带隐形防伪标识车牌级反光膜）及车牌专用烫金纸等（车牌专用烫金纸又称车牌专用热转印纸是当今国内外车牌生产企业，用于替代以往油印制作的一种新型生产工艺，凡使用车牌专用烫金纸工艺生产的车牌照，不需再过油墨和烘干机，此工艺即省时又电，并已达到国家车牌检测中心的质量要求，每块小车牌使用车牌专用烫金纸成本价参考价为￥1元）。

As the rapid development of contemporary biochemistry technology, new-style beautiful breast cosmetic is increasing also, apparent to beautiful breast effect biochemistry additive appears ceaselessly, if placenta extracts albumen of content, royal jelly, collagen, serum to wait, curative effect of product of these biology beautiful breast is apparent and safety does not have side-effect; Product of the natural plant that is a delegate with Chinese herbal medicine beautiful breast its characteristic is safety, effect good, cost is low; Have already in product of a few series can make make the same score pectoral ridgy abundant breast element, have again in the light of Female The bounce elite element with flabby, flagging breast, still have gel of be good at bosom, agent of sparge of be good at bosom.

随着现代生化技术的迅速发展，新型的美乳化妆品也越来越多，对美乳效果明显的生化添加剂不断出现，如胎盘提取物、蜂王浆、胶原蛋白、血清等，这些生物型美乳产品疗效明显且安全无副作用；以中草药为代表的天然植物型美乳产品其特点是安全、效果好、成本低；一些系列产品中既有可使平胸隆起的丰乳素，又有针对女性乳房松弛、下垂的弹力精华素，还有健胸凝胶，健胸喷雾剂等。

"The Contractor shall at any time, after the expiration of such period, as sign to the Employer , at the Employer 's request and cost, the benefit of such obligation for the unexpired duration thereof"

承包商在根据雇主的要求和由雇主承担费用的情况下，在缺陷责任期满之后的任何时间，将上述未终止的此类义务的权益转让给雇主。

1 In the event of a Subcontractor having undertaken towards the Contractor in respect of the work executed; or the goods, materials, Plant or services supplied by such Subcontractor, any continuing obligation extending for a period exceeding that of the Defects Liability Period under the Contract, the Contractor shall at any time, after the expiration of such period, as sign to the Employer, at the Employer's request and cost, the benefit of such obligation for the unexpired duration thereof

14.1 当分包商在所进行的工作，或其提供的货物、材料、工程设备或服务等方面，为承包商承担了合同规定的缺陷责任期限结束后的任何延长期间须继续承担的任何连续义务时，承包商在根据雇主的要求和由雇主承担费用的情况下，在缺陷责任期满之后的任何时间，将上述未终止的此类义务的权益转让给雇主。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。