性选择的

Methods: 1. Experimental laparoscopic liver resection: We selected pigs as experimental models aiming to approach human beings physiological and anatomical condition. After CO2 pneumoperitoneum was established, the ligaments around liver were dissociated. Livers were cut off by the methods such as clamp dissection, microwave tissue coagulator, ultrasound dissector, Ligsure dissection, hand-assisted, short abdominal incision laparoscopy-assisted, and Endo-GIA switcher. The operation time and bleeding volume were compared between different methods of laparoscopic liver resection. The advantages and limitations of different methods were summarized. 2. Clinical laparoscopic liver resection: 15 cases with tumors in segment V of anterior right lobe or segments II, III of left lateral lobe or segment IV of left internal lobe were selected in this study. The liver diseases included hepatocellular cancer, hepatic cavernous hemangioma and hepatic focal nodular hyperplasia. The ligaments around liver were dissociated after CO2 pneumoperitoneum established. Laparoscopic liver resection were carried out by some of the methods combined such as clamp dissection, microwave tissue coagulator, hand-assisted, short abdominal incision laparoscopy-assisted, ultrasound dissector, rotation and suction dissector.

1、实验性腹腔镜肝切除：以猪为实验动物，旨在接近人体的生理、解剖环境下进行实验，建立操作空间后游离肝脏周围韧带，采用钳夹分离切肝法、微波刀切肝法、超声刀切肝法、Ligsure切肝法、手辅助腹腔镜肝切除法、小切口腹腔镜辅助切肝法、Endo-GIA切肝法等方法实施腹腔镜下肝切除，比较不同切肝方法的手术时间、出血量，总结各种方法的优越性及其局限性。2、临床腹腔镜肝切除：选择肿瘤位于肝右前叶第Ⅴ段、肝左外叶第Ⅱ、Ⅲ段及左内叶第Ⅳ段的15例患者，病种包括原发性肝癌、肝海绵状血管瘤、肝脏局灶性增生，建立气腹后游离肝脏周围韧带，采用钳夹分离断肝、微波刀固化后断肝、手辅助腹腔镜肝切除、小切口腹腔镜辅助肝切除、超声刀断肝、旋吸断肝等多种方法分离切线肝组织，暴露管道结构，再采用高频电凝、钛夹夹闭、缝扎止血、止血纱布覆盖、氩气刀止血、生物胶止血、Endo-GIA处理等多种方法相结合处理肝断面，统计手术完成情况、手术时间、手术出血量、术后并发症及术后住院时间等，评价腹腔镜肝切除的可行性及安全性。

We show that under appropriate conditions,the SCAD-penalized least squares estimator is consistent for variable selection and that the estimators of nonzero coefficients have the same asymptotic distribution as they would have if the zero coefficients were known in advance.

在一定的条件下，我们证明了SCAD惩罚最小二乘估计的变量选择具有相合性，并且得到非零系数的估计与零系数已知情况下的估计具有相同的渐近分布。

Under only supposed each indidual utility function possessing some continuity, an existence theorem of selection for minority submitting to the majority is got,and prove...

通过在不同空间上构造委员会的偏好结构，指出了这种偏好的锥诱导性和这种偏好的有效选择与多目标决策问题的M－解之间的等价性。

They are contradictorily selecting in the contradictory civilization conflict, the stern situation needs scientific sex education.

在这样矛盾的文化冲突中他们矛盾地选择着，严峻的形势需要我们对大学生进行科学的、有针对性的性教育。

The choice for material of iron core, all the structure design and the method of collimation for the magnet were also described. Simulation results of Opera show that when the length of the core is 220 mm, the effective magnetic length is about 302 mm and the maximal magnetic density is around 0.215 T at four interior angles. Corresponding field uniformity is within 0.8% in the area of 133 mm×200 mm.

根据磁铁的设计指标，给出了磁铁设计要求铁芯材料选择方法、整体的结构设计以及如何对磁铁进行定位和准直，并采用Opera程序进行模拟计算，结果表明：当铁芯长度为220 mm时，磁有效长度大约为302 mm；磁感应密度最大的地方在4个内角上，约为0.215 T；在133 mm×200 mm的平面范围内，磁场均匀性优于±0.8%。

Specifically, you select which type of database you want to call and the code will use the principles of polymorphism to call the specific database class.

非常明确的，当你选择你需要调用的哪种类型的数据库时，代码会使用多态性的规则来调用准确的数据库类。

Whereas, according to a series of our surveys on the speech community in Fucun, the simpleness of some methods of traditional dialectology in certain degree do harm the spontaneousness and representativeness of language materials, and this makes us can not know the real state of a speech community.

但就我们在傅村言语社区进行的一系列调查来看，传统的方育学方法却在一定程度上牺牲了语料的白然性和代表性，并不能让我们了解一个言语社区的真实面貌，而这正是我们为什么"舍简就繁"地选择社会语言学的方法米认识傅村言语社区的主要原冈。

This method,on one hand extractes the most efficient low features for lipreading,on the other hand,selectes features reasonably to improve their distinguishability.

此方法一方面提取了唇读的最有效的低级语义特征，另一方面更加合理地选择利用了特征的有效可区分性，使得用42维二级视觉特征，对特定人的唇动内容识别正确率达到77.8%。

Whether it is the smuggling of oil prices in Guangdong diversionary influence or pressure on the weaker demand for the formation, as well as with other areas of competition, price promotions will become成品油销售Guangdong enterprises is necessary to select the future .

无论是走私油对广东价格的牵制性影响，还是需求减弱形成的压力，以及与其它地区竞争的需要，降价促销都将成为广东成品油销售企业今后的必要选择。

Following on the GATF Color reproduction test chart to make some brief account, according to the patrterns function is divided into six major areas: simple color wheel graph is used to distinguish between colors and restore color detection; contact copy control standards section, you can use to test the print process changes in dot; dot number comparison chart, used to select and screen resolutions and paper and putting it in a match for reference, but also reflects the various color version modulational cards and membership cards making parameter is set to reproduce the effect and measurement; whether it is a normal RGB: neutral gray balance control chart; gray balance, this work out Y, m, C; proofing control bars.

下面对GATF彩色复制测试图作一些简单的介绍，按图谱功能分为六大区域：简易色轮图用于辨别颜色和检测色彩还原情况；接触拷贝控制标准段，可以用来检测晒版过程中网点的变化情况；网点线数比较图，用于选择网屏线数和纸张适性的匹配参考，也可反映各色版调制卡和会员卡制作参数的设置作用和测量子再现情况是否正常；三原色中性灰平衡控制图；灰平衡卡，依此算出Y、M、C的比例；打样控制条。

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。