性选择的

In chapter 3, the chromatographic fingerprint of Erigeron breviscapus herbal sample was investigated and established by using many extract methods and optimizing experimental conditions.

内容包括提取溶剂的选择，色谱条件的优化及方法学考察等，使建立的色谱指纹图谱具备系统性、特征性和稳定性。

Then, this article details of Shell automotive friction clutch of die design, mainly from parts of the process analysis, process programs, press select and mold the structure of design aspects.

接着，本文将具体介绍汽车摩擦离合器壳的模具设计，主要是从零件的工艺性分析，工艺方案，压力机选择和模具的结构设计等方面着手。

In this paper, granite of BeiShan was chosen, experiment was made to research on the granite behavior in the effects of temperature , combining damage mechanics and viscoelastoplastic theory, tentative efforts were made in the coupling of thermal and stress as well as rheologic constitutive formula.

本文选择甘肃北山花岗岩作为研究对象，对花岗岩温度影响下的力学行为进行了初步的试验研究，结合损伤力学和粘弹塑性理论在热应力耦合和岩石蠕变本构方程方面进行了尝试性的工作。

A retrospective study design was conducted by using chart reviews to choose patients who received unilateral primary total hip and knee replacement (International Classification of Diseases, Ninth Revision, Clinical Modification procedure code of 81.51 and 81.54) in two medical centers between 2001 and 2004. Patients were excluded from the study if they had had a bilateral in the same admission, fractures, previous arthroplasty surgery complication, bone cancer, pathological fractures, infection and hemophiliac.

采回溯性病历审查方式，选择台湾地区两家医学中心施行全人工髋及膝关节置换术的全部医师作为研究医师，以ICD-9-CM中之主手术码为81.51及81.54，排除符合同次住院施行双侧、骨折、先前手术的并发症、骨癌、病理性骨折、感染、血友病条件后，分别为716名及1，498名接受初次全人工髋及膝关节置换的病患。

Objective:To observe the effect of laparoscopic cholecystectomy on chronic calculous cholecystitis with various kinds of hepatopathy in 173 cases.

目的 ：观察腹腔镜胆囊切除术(laparopscopiccholecystectomy，Lc)对173例慢性结石性胆囊炎合并的各种肝病的影响，以确定Lc在各种肝病中的合理选择。

Whatever the cause of homosexuality (and there is great debate on the subject), one certainly does not 'choose' to have homoerotic feelings in the same way one would, for example, choose to have tea instead of coffee.

在这个问题上一直有很大的争论），都没有人会去选择有一种同性恋的性欲望，这并没有象喝茶还是喝咖啡的取舍那么简单。

Based on summary and analysis of various forms of contract between firm and customer, it is found that contract relationship in essence is problem of adverse selection and moral hazard because of information asymmetric and contract items imperfectness.

在总结和分析企业与客户契约关系不同形式的基础上，指出由于信息不对称和契约的不完备性，逆向选择与道德风险问题成为企业与客户契约关系的本质特征。

And the securitization cannot solve the problems of adverse selections, etc. The market failure of catastrophic insurance market necessitates the government intervention, and the expansion of the definition of insurability to the whole economy, including public sector, supports the intervention theoretically.

巨灾风险证券化部分解决了商业保险市场资本相对不足的问题，但费用高昂和流动性差等因素限制了巨灾证券的应用，并且对于诸如逆选择等限制巨灾风险可保性的因素巨灾证券化无能为力。

Fashion and intellectuality immediately present. It is suitable for daily use.

相信你自己的选择吧，时尚知性的你即刻呈现，适合日常的使用。

Just believe your choice. Fashion and intellectuality immediately present.

相信你的选择吧，时尚知性的你即刻呈现，适合日常的使用。

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。