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The influence on absorption coefficient brought from shape choice with cylindrical or cone-shaped cavity, square or hexagonal profile, from different closure as air or water, from different material properties and structure sizes, are analyzed based on the numerical calculations. Some general characteristics are summarized. It shows that lowest resonance frequency of sound absorbent coefficient is inversely proportional to volume of cavity and sound absorbent coefficient is proportional to perforated percentage.

2通过数值方法研究了吸声结构内腔为圆柱腔和圆锥腔、基材的剖面形状为正四边形和正六边形、不同背衬、基材材料特性、尺寸大小对整体吸声效果的影响，总结了这些情况下非旋转对称吸声结构的声学特性变化规律，得出腔体体积越大，吸声系数最低共振频率越低；穿孔率越大，吸声系数越大的结论。

This dissertation studied the overcompensatory responses of cotton,Gossipium hirsutum L. plants to leaf loss, square loss and cell sap lossand the changes in some physiological and biochemical contents with timein the case of overcompensation. The artificial defoliation, early squareremoval and aphis colonization were used as three types of simulated ornatural herbivory. The target of this study is to elucidate thephysiological mechanism of cotton plant overcompensation for insectherbivory.

本文以棉花为实验材料，采用人工去除棉花一部分叶片、花蕾及接种棉蚜的方法，分别模拟昆虫食叶、食蕾及吸汁为害等三种为害方式，研究棉花对于失叶、失蕾及损失细胞汁液所产生的超补偿作用，及一些生理生化代谢随棉花发育时间进程变化的情形，以期较为系统地从多个方面阐明棉花对于虫害超补偿作用的生理学机制。

Zhengzhou Stomatological Hospital is situated 100 meters North of Erqi Cenotaph, with an area of 5.4 Mu and construction area of 20,300 square meters.

郑州市口腔医院座落于二七纪念塔北100米，占地面积5.4亩，建筑面积20300平方米，医院始建于1956年，经过近50年的艰苦创业和不懈努力，现已发展成为及医疗、科研、教学、预防为一体的省会唯一一所口腔专科医院。

Square plate in accordance with the sealing performance of different chain can pump water height are not the same.

根据方板的密封性能的不同，链泵所能提水的高度也不尽相同。

To solve the characteristic polynomial and the eigenvalues of square matrices with higher order normally is not an easy way.

1引言在高等代数中，求一个n阶方阵A的特征值时，常用的方法是求解A的特征多项式|λE-A|的根。

Paradise Square charwoman of Gong on the Little Green interested in the Little Green to sell the first time have sex that night resentment agitated, so desperately in another room shake Liu Xiaoqing Rapporteur sleep outside with the "wavy-bed", resulting in premature ejaculation outside Liu Rapporteur.

极乐坊打杂的小工对小青有心，在小青卖出第一次做爱那晚愤恨难平，于是拼命在另一间房摇动刘员外与小青睡的"波浪床"，导致刘员外早泄。

The LM statistic follows chi square distribution with q degrees of freedom under the null.

LM统计量在零假设下服从 q个自由度的卡方分布。为什么乘上n-q而不是n？

Is the Chi-Chi Group, a wholly-owned subsidiary of Xuzhou is located in the downtown area with a registered capital of 3,000 million yuan, more than 3,000 square of office space, is a set of software and hardware development and production, weak systems integration, information security systems integration, information security services and IT outsourcing services as one of the high-tech enterprises.

更自由、更宽广、更精彩的境界。江苏中驰科技发展有限公司是中驰集团旗下的全资子公司，位于徐州市中心地段，注册资金为3000万元人民币，办公面积3000多平方，是一家集软硬件开发生产、弱电系统集成、信息安全系统集成、信息安全服务及IT外包服务为一体的高新技术企业。

According to the promoters of the party, the square will be transformed with a diverse selection of live performances including a traditional Chinese dragon and lion dance.

据该聚会的承办人所说，该广场将会焕然一新，到处是各式各样的现场表演，包括传统的中国舞龙和舞狮表演。

A day noon, I finish eat lunch just as since go toward ground dynasty the school walk to , soon walk to an inside noon almost no one process but again leave school last exit, a the take be black brown glasses, two cheeks hemp tired, often smoke cigarette of lips, square face, top wear a Zhe stone the leather jacket of the color, bottom wear brown west trousers, height one meter 86 or so middle age mans(from here thorough judgment is have no industry personage, choler, habit bad cunning pole ……cheat experienced person, look like brain to have a problem) call I:"Kid, don't go in and see with me, the inside have blood!"

一天中午，我吃完午饭就一如既往地朝学校走去，快要走到一个中午几乎没有人经过而又离学校最近的出口时，一个带黑褐色眼镜、两颊麻疲、常吸烟的嘴唇、方形脸，上身穿赭石色的皮夹克，下身穿褐色西裤、身高一米八六左右的中年男人（由此深入判断是个无业人士，脾气暴躁，嗜好不良阴险之极……欺骗老手，貌似脑子有问题）叫住了我："小朋友，要不要跟我进去看看，里面有血！"

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。