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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。

The general form of solution for the non symmetric matrix A is given, the expression of optimal approximation solution is presented, and an algorithm for solving the problem is described. The total least squares problem with symmetric and bisymmetry constraints is discussed respectively. A sufficient condition for existence of solution is derived by use of the theory of matrix Ricaati equation. The general form of solution is given if the problem has a solution, and the expression of optimal approximation solution is presented. Some numerical examples are given.

对矩阵A是非对称情形，给出了解的一般表达式，证明了最佳逼近问题解的存在唯一性，并给出了其解的表达式，描述了求解问题的算法；讨论了带对称和双对称约束的总体最小二乘问题，利用Ricaati矩阵方程的理论得到了解存在的一个充分条件，分别对对称矩阵和双对称矩阵两种情形，给出了解的一般表达式，证明了最佳逼近问题解的存在唯一性，给出了其解的表达式，提出了求解这些问题的算法，并给出了数值例子。

My first love comes earlier, bitterer also, because the age at that time and courage are not great, know perfectly well the other side already desire for love is dark make, but still spend sufficient full the hand that time of 3 years just played this to learn elder sister, the happiness that Dan Chi comes to not = after suffering comes happiness, very fast in getting together to leave much pure Platonism less I am learned the reason discard that elder sister objects with family.

我的初恋来得比较早，也比较苦，由于当时的年纪和胆子都不大，明知道对方已春心暗许，但仍花足了整整三年的时间才拉上了这位学姐的手，但迟来的幸福并不=苦尽甘来，在聚少离多的纯精神恋爱中很快我就被学姐以家人反对的理由弃置。

Based on the invariance of maximum likelihood estimation, the sufficient and necessary condition under which the maximum likelihood estimation has invariance for the parameters are given, then it uses this conclusion to calculate the maximum likelihood estimation of σ^2 and ρ for bivariate normal distribution.

根据参数极大似然估计不变性原则，给出在一定条件下极大似然估计具有不变性的充分必要条件，并利用该结论计算了二元正态分布Z=的未知参数σ^2和ρ的极大似然估计值。

Hence there are sufficient nutritive produces and water supply endowed on the blackland. The lesser Xinq'an mountain is rich in wild specialties, animal dejecta and humus containing, like infusion Chinese medicine, organic and trace elements.

纯净水灌溉：白山黑水之间，山水纯净，水系丰溢，大小兴安岭上丰富的山产品和以野草、野果为食的动物的粪便以及原始森林中多年积累的腐殖质，都富含着有机质和微量元素，这些有机质和微量元素经过雨水浸泡和冲刷，就像熬制好的中药一样，汇集成大大小小的河流，直接注入黑龙江这片平整的黑土地，从而像血管一样，滋润着本就肥得流油的寒地黑土。

Ultimately, Solo's offer proved to be sufficient for Pellaeon and the Moffs to agree to the deal, and Pellaeon took the Star Destroyer Bloodfin and a small fleet to Fondor.

最后，索洛说服了佩莱昂和星区总督，他们同意入盟。于是，佩莱昂指挥"血鳍鱼号"歼星舰和一支小型舰队向方多进发。

But really want to boiling water, and the need for sufficient patience to wait.

但真的要烧开水，并且需要有足够的耐心等待。

Vincent, in our view, does not take sufficient account of the role of the ex-Stalinist, Bonapartist state in steering the transition in China.

在我们看来，就中国而言，文森特没有充分考虑到中国前斯大林主义者波拿巴国家在指导国家过渡上所发挥的作用。

We in Shanghai have their own bonded warehouse and have sufficient inventory, a very professional tool technology Service engineers, can provide a full programme of the tool.

我们在上海有自己的保税仓库，有充足的库存，有非常专业的刀具技术服务工程师，可为你提供整套的刀具方案。

A central figure in the bail system is the professional bondsman, whose services are available twenty-four hoursa day to those who need to produce sufficient cash to be released.

保释制度的中心人物是职业保人，他们全天24小时向那些需要提供充足的现金以获释的人提供服务。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。