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Based on works above all, the thesis compares results of positive analysis with what is going on in real markets, proceeds to verify the results of positive analysis, the thesis brings forward some advice in order to reform and perfect the China"s agricultural commodity futures markets.The first two chapters in this article investigates the unbiasedness hypothesis of futures prices in China"s agricultural commodity futures markets.

第二章详细介绍了协整技术和误差修正机制，利用该技术分析了距离最后交易日一月、二月、三月、四月、五月和六月期的大豆和小麦期货价格与现货价格之间的协整关系，发现四月期以内的大豆和二月期以内的小麦期货价格是对现货价格的无偏预测，而五月、六月期的大豆和三月期的小麦期货价格不是现货价格的无偏预测，四月、五月、六月期的小麦期货价格与相应的现货价格不存在协整关系。

The corrosion fatigue crack growth and near-threshold characteristcsof high tensile steel HT60 were investigated by using the compact specimens underexposure to synthetic sea water. The da/dN vs △K_ relation in air may be conser-vetivel estimated for that in sea water. In the high △K region with high stressratio, owing to the acceleration of crack growth promoted by stress-induced dissol-ution, the crack opening stress intensity factor K_ represents only the result ofcrack surface in contact with corrosion products, so as to give an overestimation ofK_ at crack tip.

对高拉力钢HT60的腐蚀疲劳裂纹扩展特性和门槛值区域特性，采用紧凑拉伸试件在人工海水中进行了实验和研究，结果表明：在空气中的da/dN与ΔK_关系可以作为在海水中的da/dN与ΔK关系的一个偏保守的预测；在高应力比的高ΔK区域，由于应力诱起溶解促进了裂纹扩展的加速；该裂纹开口应力强度因子K_仅反映了裂纹表面同腐蚀生成物接触的结果，从而导致了K_在裂纹尖端的偏大的估计结果。

These are skirts that are open at the front or back, revealing an underskirt beneath.

即便是刚到膝盖的裙子对于比较高的少女就相对偏短，对于较小的少女来说又相对偏长，如果你的裙子显得很短，你可以穿上一件衬裙或者同色系的撑裙以使你的裙子看起来长些（最近，在着装中穿着多彩的衬裙或者长款的T恤也成为一种时尚主流。

As a result of error distribution\\\'s non-uniqueness, draws out to the standard deviation understanding again, by about standard deviation reflected that the erroneous zero rank value two side the variation targets, the application unimodal distribution fits the error distribution, the goal is: By approaches the rationality which under the enhancement goodness of fit\\\'s premise determines to the error.

从文章的上下文感觉此标准值似乎是人为规定的，并不受实测数据本身分布的影响，不具有客观性。个人认为：研究在实际中实测数据相对于均值的分布更有意义。按照作者的观点，误差的分布都是单峰的，除了正态分布这种对称分布外，作者认为还有不对称的偏峰分布。因此研究这种偏峰分布模型可能更有意义。

However, there have beensome problems exposed during past three years that can not be neglected, say highand unobvious gap of house prices, high investment ratio in house selling.

然而，不能忽视的是，珠海的房地产业在过去三年的快速发展中，也暴露了不少问题，如房价收入比偏高、阶梯房价不明显、投资性购房比例偏大等。

In our experiment, we use a low temperature heater to fuse the coupling section, the first polarization modulation waist point in the power transfer curve monitored with unpolarized 1312-nm laser light is taken as the stopping point in the coupler drawing process.

实验中，我们用一个低温热源加热耦合段，并采用圆偏振1 312 nm激光源作为监测源，在功率转换曲线上第一个偏振调制点处停止熔拉操作。

After that the territor ial extensional stress field caused by the plates movement and the mantle upheave etc. makes the Yishu fault system keep on cutting downward tend to form rift valley. The tectonism causes the fairly large-scale invasion of the small neutral -partial alkaline rock-bodies and the gold mineralization in the Linyi area.

燕山中期板块俯冲运动和地幔上涌等因素引起的区域性拉张作用使沂沭断裂继续向下深切张裂，向裂谷性质演化，造成沂南、临沂等地区较大规模中性偏碱性次火山岩型小岩体的侵入和火山喷发，在火山机构内或围绕次火山岩小岩体形成与中性偏碱性次火山岩有关的次火山岩型金矿化。

Because of the regional difference of soil and climatic conditions, the division of 4 stages of soil moisture circulation is not all the same between different areas; the soil moisture dynamics between different dry farming areas in the Yellow River Basin is contrasted in this report. The results indicate that soil moisture increases gradually from dry semi-arid area to semi-arid area, dry semi-humid area and semi-humid area, and the high value district generally appears during soil moisture resuming period in rainy season or soil melting period. While the low value district appears at the stage of fast evaporation in spring or slow evaporation in autumn; in views of vertical changes of soil moisture, it is showed that the variation range of upper lays is larger than that of lower among the different dry farming areas in the Yellow River Basin.

由于各区域之间土壤、气候条件的差异，各地土壤水分循环4个阶段的划分也不尽相同；黄河流域不同旱作类型区土壤水分动态变化比较结果表明：就季节变化而言(来源：A70b0B0bC论文网www.abclunwen.com)，由半干旱偏旱区→半干旱区→半湿润偏旱区→半湿润区土壤水分含量呈逐渐增加的变化趋势，而且高值区一般出现在雨季恢复阶段或春季土壤融冻返浆时期；而低值区均出现在春季大量蒸发阶段或秋季缓慢蒸发阶段；就垂直变化而言，黄河流域不同旱作类型区土壤水分垂直变化的趋势均表现为上层变化幅度较下层大。

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反对同样有能力是除此之外同意向偏于双方以书面形式或者同样有能力被包含在中决定性的文档为关于的项目没有保单的一些种类的是否明确或者暗示被让步偏于提供者用尊重向一些机密关于的信息或者一些其使用和机密关于的信息被供养在上一"ASIS"基础和提供者以此方式明确放弃权利所有的这样保单包括一些暗示保单的适销性和健身为 a 细目的目的，非违反和准确性和任何保单，起源于表现的课程，给予的课程或者贸易的使用。

Polyvinylidene Fluoride is polymerized from Vinylidene Fluoride, it owns outstanding characteristics of high mechanical intensity, good radiation resistance.

聚偏氟乙烯是由偏氟乙烯聚合制得，简称PVDF。

The objective is to subjugate and discourage the people, because that allows the elite to continue to rule unopposed.

其目的是压制和打击人民的积极性，因为这可以让实权派继续统治不会沦为反对派。

GOD,this is the second time you vanquished me!

天啊，这是第二次你打败了我！