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Applyingthe sufficient and necessary condition of biquadratic Bézier patch being non-negative,a method is presented to see whether two points are the closest points between twobiquadratic NURBS surfaces when the two points are respectively on the two surfaces. Based on the method, the surface split algorithm is improved while the surfaces arebiquadratic NURBS surfaces.

本文利用双二次 Bézier 曲面为非负的充要条件，提出了分别位于两张双二次 NURBS 曲面上的点是否为这两张曲面间距离最近的点的判别方法，并由此在双二次 NURBS 曲面的场合对计算最短距离的曲面分割法作了改进。

Events,Operation and Relation of Sets, Classical Probability, Geometrical Probability , Statistical Stability of a Frequency, Axioms of Probability, Conditional Probability, Total Probability Theorem, Bayes' Rule,Independent Events,Independent Repeated Trials, One Dimensional Random Variables, Discrete Random Variables, Distribution Function of a Random Variables , Continuous Random Variables, Normal Distribution, Distribution of a Function of a Random Variable, Multidimensional Random Variables, Joint Distribution Function, Marginal Distribution Function,Discrete Two—Dimensional Random Variables,Continuous Two—Dimensional Random Variables, Independent Random Variables, Distribution of Functions of Random Variables,Expectation,Variance, Covariance, Coefficient of Correlation, Bivariate Normal Distribution, Law of Large Numbers, The Central Limit Theorems, Sample and Population ,Chi—Squared, T and F Distributions , Sampling Distributions , Point Estimation , Interval Estimation , Testing Hypotheses , A Test of Significance for Parameters in a Single Sample From a Normally Distributed Population , A Test of Significance for Parameters in Two Sample From Normally Distributed Populations .

本课程的主要内容：概率的概念与运算、随机变量及其分布、随机变量的数字特征与极限定理、数理统计的基本概念、估计和检验的基本方法，随机事件与概率随机事件、事件的关系与运算、几何概率、统计概率等，条件概率、全概率公式、贝叶斯公式、事件的独立性、二项概率公式，随机变量的概念、离散型随机变量、随机变量的分布函数、连续型随机变量、随机变量函数的分布，多维随机变量及其分布函数、边缘分布函数、随机变量的独立性、二维随机变量函数的分布，数学期望、方差、协方差和相关系数、大数定律、中心极限定理，总体与样本， X 2-分布、 t-分布和 F-分布，统计量及抽样分布，假设检验的基本概念、单个正态总体参数的显著性检验、两个正态总体参数的显著性检验。

More those who make a person furious is, after be being sealed in the website, applying for solution to seal gotten result for the first time is consistent, still be data likewise unusual, and more blackguardly is to should survey two months, what calls observation two months, must still let us hang your free ad over to wait for two months to see a result?

更让人气愤的是，在网站被封以后，第一次申请解封得到的结果都是一致的，还是同样是数据异常，而且更无赖的是要观察两个月，什么叫观察两个月，难道还得让我们把你们的免费广告挂在那里等两个月看结果吗？

Ellison along. You can break into two groups of two, covering two blocks of the area each.

Ellison，这样的话你们就可以分成两组，每组负责2个路口。

And you shall make for the breastpiece two rings of gold, and put the two rings on the two edges of the breastpiece.

在胸牌上也要做两个金环，安在胸牌的两头。

They found that the marine atmosphere and the coastal ocean actually exchange buoyance and momentum within the meso-scale spatial and temporal domains of both fluids, spanning two to two thousand kilometers and ten minutes to ten hours on the atmospheric side and one to one thousand kilometers and seconds to two weeks on the ocean side.

他们在长期的研究中发现，在大陆沿海和近海区域的大气和海洋之间的相互作用实际上是在多种中尺度范围(空间尺度：对大气，2-2000km；对海洋，1-1000km；时间尺度：对大气，10分钟到10小时的量级；对海洋，几秒到两个星期)内的热量和动量的相互交换。

My brother was to sleep in the bedroom with my parents and my two sisters and I had the other bedroom, as there were only two beds in the room, I was to sleep on a camp bed between the two.

我哥哥和我的父母住一个房间，而我和两个姐妹住另一个房间。因为那房间只有两张床，所以我就在她们俩中间架了个行军床。

Methods: The 80 four weeks old SD rats were divided into 8 groups at random.ie.normal group、physiological saline solution group、 Western medicine group、 angelica tonify the blood decoction group、 tonify the blood decoction add chalybeate group、 AS two solstices pill group、 AS two solstices pill add chalybeate group、AS two solstices pill add semi-dose chalybeate group.

4周龄SD大鼠80只，随机分成8组：即正常对照组、模型生理盐水组、西药组、当归补血汤组、当归补血汤加铁剂组、加味二至丸组、加味二至丸加铁剂组、加味二至丸加半量铁剂组。

It can improve the Hb、SF obvious and reduce FEP.There curative effect of AS two solstices pill add chalybeate is much better than that of simplicity chalybeate、angelica tonify the blood decoction and AS two solstices pill.But there is similar curative effect between AS two solstices pill add general chalybeate and add semi-dose chalybeate.

加味二至丸加铁剂组对缺铁性贫血模型大鼠有明显治疗作用，能明显提升IDA大鼠的Hb、血清铁蛋白，降低红细胞内游离原卟啉，较单纯铁剂、当归补血汤及加味二至丸治疗IDA疗效好；加味二至丸加常规剂量铁剂和加半量铁剂有相似疗效。

First, it was to obtain two binary images from segmenting image by two thresholds. Second, erosion, opening and closing were done to the two images according to some knowledge of the shape and location of the objects in the image that we have already known. Last, the edge information from the image segmented by a high threshold was put into the image segmented by a low threshold. It is the way to segment and discern circular objects accurately from the complex image and can greatly improve the accuracy rate of discerning.

首先分别根据两个阈值进行分割得到两幅二值图像，然后根据目标是圆形以及其大致位置等先验知识分别对两幅图进行腐蚀，开启，闭合等数学形态学运算，将高阈值分割得到的图像中的边界信息叠加到低阈值分割得到的图像中，实现对复杂背景图像中圆形物体的准确分割与提取，解决了复杂背景图像中物体识别率低的问题。

He paid $5,000 for this cupcake.

他我这个纸杯蛋糕花了5000美元。

I mean, if you want to, that is

我的意思是，如果你们想吃的话。