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However, since high-fiber makes transmission insulated between the high-voltage and low-voltage, there isn't any electromagnetic contact between the high-voltage and low-voltage. So, how to supply power for high-voltage circuits become pivotal technology, which is difficulty in research technology.

但由于采用光纤传输使高低压绝缘隔离，高低压之间没有任何电磁联系，因此如何向有源ECT高压侧电路供电就成为一项关键的技术，是研制中的技术难点。

High-frequency and high power electronic or microwave devices, because of their excellent properties such as wide band gap, high electron saturation drift velocity, low dielectric constant, high thermal conductivity, good chemical and thermal stability, and so on.

同时由于GaN基材料具有电子漂移饱和速度高、介电常数小、导热性能好、化学和热稳定性好等特点，也非常适合于制作高温、高频及大功率电子器件。

The paper induces and analyzes research method of the tooth, including Method line of the tooth theory,Envlopment theory, Camus theory, Circling cluster theory and so on.Based on the past theories,the new measure to deduce the chain wheel tooth equation of roller chain at high speed,Circling cluster and envlopment theory,is proposed by analyzing basic concept of equidistant curve and Willis theory.Following the presentation of drawing lessons from traditional roller chainof the change of stanza line distance. A new type of roller chain at high speed is given in the paper.The paper studies deeply structural characteristics, the change of stanza line distance,separation between plank and bore and so on.According to design requst of roller chain at high speed and the study ofH_y--V_0 tooth chain,the impossibility that Quasi-conjugage engagement theory isrealized by the engagement of roller chain at high speed from the aspect of theory is decribed.

作者综述了高速滚子链国内外研究现状，并进行了以下研究工作：归纳分析了齿形法线法理论、包络法理论、卡姆士定理、圆族法理论等齿形研究方法，在此基础上，结合齿形啮合基本定律，分析了等距曲线的基本概念，提出了一种推导高速滚子链链轮齿廓方程的新方法—圆族包络法；在借鉴普通变节距滚子链的基础上，本文提出了一种新型的高速滚子链链条，深入研究了高速滚子链链条结构特性及其变节距、板孔中心分离等特性。

And also metal material's corrosion form and method of anticorrosion are analyzed. The review still includes water chemistry's function, principle, type and characteristic in utility boiler. And the dissertation's studying direction, content and method are determined against the current existing problem of water chemistry of utility boiler. 2. High temperature potential-pH equilibrium diagram's application and high temperature solution's practical pH calculation The application method of high temperature potential-pH equilibrium diagram and solution's practical pH at high temperature are analyzed and calculated.

本文所做的主要研究工作有：一、火力发电站热力系统防腐综述及论文研究方向与内容在查阅大量国内外文献和资料，并结合多年来工作和研究经验的基础上，对火力发电站热力系统的组成、工作环境、常用金属材料、常见腐蚀形态、常用腐蚀控制方法以及电站锅炉水化学工况的作用、原理、类型与特点等作了全面深入的分析和总结，并针对目前电站锅炉水化学工况应用中存在的问题，提出了本文的研究方向、内容和方法。

High fever, cough more obvious symptoms of runny nose, rash Department before the buccal mucosa plaques many measles; rubella general fever is not high, little cough, ears, the occipital lymph nodes; measles exanthema high fever, 2-3 days after the fever that is, on its own;恶寒early scarlet fever, throat swelling fester, the "Yangmei" tongue-like; chickenpox generally lighter symptoms, fever is not high.

全身症状麻疹发热较高，咳嗽流涕症状较明显，出疹前颊粘膜处多有麻疹粘膜斑；风疹一般发热不高，少有咳嗽，耳后、枕部淋巴结肿大；小宝宝急疹发热较高，2—3天后即自行退热；猩红热初起恶寒发热，咽喉红肿溃烂，出现"杨梅"样舌；水痘一般症状较轻，发热不高。

The shell of the liquid crystal auto-changing shade welding is made of high-performance plastic which is high strength and without leaking light. In addition to, by adding fire retardant and other special components , it has meet to the demand of inflaming retarding and could bear the high and low temperature .For resistance to impact, besides of choosing lightweight and high strength material, we also consider more in the aspect of the mechanics and human engineering in the design of the structure .In order to insure the comfort for wearing , we make the inside and outside protection piece and the shell of the face guard to a camber shape ,it also enhances the ability of resistance to impact.

液晶自动变光焊接面罩的壳体采用高性能的塑料注塑制作而成，高强度，不漏光，并通过在面罩材料里添加一定配方的阻燃剂和其他特殊成分，达到了阻燃和耐高低温等要求；为了抗冲击，除了材料选择轻质高强度材料外，在结构设计上更多的从力学和人体工程学方面考虑，保证了佩戴的舒适，而将内外保片与面罩壳体结合设计成能够最大承受外界力量的弧型，增加了面罩抗冲击能力。

This time, with even more forward-looking idea, South Beauty aims at the high grade food service market in Shanghai and launched to the market two restaurants with different orientations. South Beauty Chef's style restaurant aims at high-end consumers from China and foreign countries, and will take its high-grade Chinese cuisine as its competitive products. South Beauty Steam restaurant will aim at high-and-mid-end consumers with its rich fashionability, healthiness, abundance and exquisiteness.

此次更以前瞻性的创新理念面向上海中高端餐饮市场，双管齐下推出了两家不同定位的餐厅：俏江南私房菜餐厅将主要面向中外高端消费群体，菜品也将以高档的中式料理为核心竞争产品；而俏江南蒸菜餐厅将以其时尚、健康、丰富、精致的内涵面向中高端消费人群。

Based on the prior information obtained by qualitative inversion, the two stages inversion method was put forward. That is, the first stage is that distinguishing the high-quality element and non- high-quality element, and determining the initial iteration value of element sound velocity reasonably. The second stage is that treating differentially the constraint weights of the high-quality element and non- high-quality element, and then quantitatively inversing the final sound velocity distribution. The results of two concrete specimens indicate that the two stages inversion method can inhibit artifacts effectively and has better defect identification effect than normal one stage inversion.

在获取定性反演先验信息的基础上，提出了两阶段反演的方法：第一阶段，区分优质像元和非优质像元，合理确定像元声速的迭代初值；第二阶段，区别对待优质像元和非优质像元的约束权重，定量反演最终的速度分布。2个混凝土试件的模型试验表明，两阶段反演能有效抑制伪像，具有比常规的一阶段反演更好的缺陷识别效果。

The key products of the company are high alumina brick ,fireclay brick ,phohate-bonded wearable brick,exfoliation-resistant high alumina brick,High refractorine under load brick,corundum brick,magnesite brick,magnesite chrome brick,series of corundum,SIC furnace chamber and pipe , ceramisite brick, corundum-mullite brick,corundum-chrome brick,sillimanite brick,magnesite alumina inel brick,acid-resistant brick,alkali-resistant brick , zirconia-corundum brick , alumina bule products, series thermal iulating refractory products ,high alumina castable,corundum castable ,corundum ramming ,brown-corundunm castable ,SiC castable ,low-cement castable ,alkali resistant castable ,Light silica alumina products, stainle steel fibre reinforced castable ,etc.

主要产品有：高铝质砖、粘土质砖、磷酸盐耐磨砖、抗剥落砖、高荷软砖、刚玉砖、碳化硅砖、镁砖、镁铬砖、各种刚玉、SIC炉膛、炉管制品、陶粒砖、刚玉莫来石砖、铬刚玉砖、硅线石砖、镁铬尖晶石砖、耐酸砖、耐碱砖、锆刚玉砖、氧化铝空心球制品及各种轻质保温材料、高铝质浇注料和刚玉浇注料、捣打料、棕刚玉浇注料、碳化硅浇注料，低水泥浇注料、抗碱性浇注料、轻质硅酸铝制品、钢纤维增强浇注料等80余种系列耐火材料。

High-pressure boiler tubes often used in high temperature and high pressure conditions, at high temperature flue gas pipe and the role of water vapor, the oxidation and corrosion will happen.

高压锅炉管使用时经常处于高温和高压条件，管子在高温烟气和水蒸气的作用下，会发生氧化和腐蚀。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。