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In general, this paper includes several parts, shown as the following: The first part summarizes the background and outline of stock index future and introduce briefly its local status and CSI 300 stock index future contract. The second part has a retrospect of the main academic papers of both local or overseas, and also a discussion of relevant hedge strategies and models, to lay a solid theoretical foundation for the empirical analysis and test for the operation process of hedge in latter parts. The third part outlines the principle, key factors and real operation process of hedge. Moreover, it makes a empirical analysis on popular hedge models with HK Hang Seng index. In the end, it test the hedge effect of trading on IF0706, CSI 300 stock index future contract, with CCB select-growth securities fund as present underlying. The fourth and also the last part, explores how to define hedge ratio in china mainland market. It includes the stability test ofβfor local securities portfolio, adjustment of historicalβand best data length for estimation of historicalβ, etc. Also, the thesis makes some beneficial experiments on the definition of best data length for estimation of historicalβ, survey of fashion forβand variation for industryβs. Fortunately, it's got some meaningful results.

按照以上研究思路，本论文论述由以下几个部分构成：第一部分，简要概述股指期货产生的背景和基本情况，对国内股指期货进程和沪深300股指期货合约进行简单介绍；第二部分，回顾海内外股指期货避险研究的主要文献，讨论相关避险策略及避险模型，为后面套期保值策略如何有效运用的实证分析和检验提供理论基础和依据；第三部分，对套期保值的原理、关键因素及实际流程进行概述，并采用香港恒生指数对常用的几种避险模型进行实证分析，最后一揽子以建信优选成长股票型基金为现货标的，实际检验以沪深300股指期货模拟交易IF0706产品进行对冲时的套期保值效果；第四部分，探讨国内确定避险比率的过程，包括国内股票组合β值的稳定性检验、历史β值的修正及估计历史β值的最佳数据长度等，通过数据分析，本文在寻找估计β值的最佳数据长度和考察风格、行业β值的差异上做了较为有益的尝试，并得到了有助于现实操作的结果。

The total RNA was extracted from spleen of Xiphophorus helleri which had been immunized for two weeks. The core sequence was amplified by RT-PCR. The cDNA end sequences were amplified by RACE, and then the full-length cDNA of sIgM heavy chains gene were obtained by putting all of them. The full-length sequence contains the immunoglobulin signature sequence: FKCIANH.

以免疫两周的剑尾鱼为材料，提取脾脏总RNA，通过逆转录－聚合酶链式反应扩增出分泌型免疫球蛋白M(secretory immunoglobulin M， sIgM)重链基因的核心序列，再应用3'和5'快速扩增cDNA末端方法扩增其末端序列，拼接后获得剑尾鱼sIgM重链全长cDNA序列。

The length of the work by drawing the corresponding part of the solid line of work, so that the time coordinates in the horizontal projection of length equal to working time ; virtual work because they do not account for ...

按各工作的时间长度绘制相应工作的实线部分，使其在时间坐标上的水平投影长度等于工作时间；虚工作因为不占。。。

Finally, the run-length of data points are extracted by horizontal projection, and the modules corresponding to the run-length are taken to decode.

而拍照所造成条码边界的形变，利用反透视转换(Inverse Perspective Transformation)来校正。最后以水平投影的方式撷取出资料点的长度，转换成对应的模组来进行解码的动作。

The result indicates that the hyperconjugation effect from lone pairs on nitrogen atoms to germinal N-N bonds can play an important role in the N-N bond length. The N-N bond length displays reverse dependence on the charge density in bond critical points obtained from AIM.

NBO分析表明N原子孤对电子到相邻的氮氮键的超共轭作用是影响氮氮键长变化的主要因素，AIM计算的氮氮键的键临界点电荷密度与键长呈反比关系。

The sine of an angle is the ratio of the length of the opposite side to the length of the hypotenuse.

正弦是股与弦的比例，余弦是余下的那条直角边与弦的比例。

My task was a very hard one; but, as I was absolutely resolved- as my cousins saw at length that my mind was really and immutably fixed on making a just division of the property- as they must in their own hearts have felt the equity of the intention; and must, besides, have been innately conscious that in my place they would have done precisely what I wished to do- they yielded at length so far as to consent to put the affair to arbitration.

我关了窗，把一个垫子挂在门上，免得雪从门底下吹进来，整了整火，在炉边坐了近一个小时，倾听着暴风雪低沉的怒吼，我点了根蜡烛，取来了《玛米昂》，开始读了起来――残阳照着诺汉那城堡峭立的陡壁，美丽的特威德河又宽又深，契维奥特山孑然独立；气势雄伟的塔楼和城堡的主垒，两侧那绵延不绝的围墙，都在落日余辉中闪动着金光。

The results were as follows:The embryo-bud length, embryo-shoot length, embryo-shoot number and dry weight of embryo-shoot of maize inbreed line decreased evidently under osmotic stress within germinating period. So the germination date was delayed, the germination rate and viability decreased.

研究结果如下：在萌发期渗透水分胁迫条件下，玉米的胚芽长、胚根长、胚根条数、胚根干重等均有明显的下降，因而发芽时间延迟，发芽率下降。

contraction length of 103 cm, elongated length of 140 centimeters after the outer tube diameter of 25 cm, inner tube diameter of 22 centimeters.

收缩后长度是103厘米，拉长后的长度是140厘米，外管直径25厘米，内管直径22厘米。

Also using inseam length as a guide, this formula calculates 88.3% of your inseam length and uses it to measure the distance from the centre of the bottom bracket to the top of the seat height.

也是利用inseam长度作为指标，主要是BB到坐垫最高位置的长度是inseam长度的88.3 ％。

This was not understood at the time, and therefore went unaddressed, until ascension became so distorted that we chose to stop ascending and wait for a time when all records would be revealed.

这在当时没有被了解，因此进行着无改编，直到提升变得如此扭曲，我们选择去停止提升并等待所有记录能被揭示的那一天。

The attack＇s nuisance value is increased because mobile phone networks also send notifications of new voicemail by sms,so an attacked phone may stop advising of new voice messages too,it warned.

它警告：这种攻击的危害增长是因为移动电话网络也会通过短信发送新语音邮件的通知。所以受到攻击的手机可也以停止新的语音信息的提示。