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The interpolate algorithms of three-order NURBS curve and double three-orders NURBS surface are presented. The expressions of partial derivative and normal curvature of NURBS surface are derived by the theory of differential geometry. The geometric characteristics of different curvature area of the free-form surfaces are analyzed in detail. All these work lays a theoretical foundation for constructing the cutter location calculating model of free-form surfaces NC machining. 2 On the basis of analyzing the methods of cutter path generation, the standard of evaluating the various methods of cutter path generation is presented. The method of generating cutter path with constant scallop height is presented for the first time.

本文以提高复杂曲面多坐标数控加工精度和加工效率为目的，在对国内外研究现状进行深入分析的基础上，对数控编程中各环节的关键技术问题进行了深入研究，主要内容包括以下几方面： 1 分析了复杂曲面各种造型方法的优缺点，给出了根据各种边界条件所确定自由曲面的NURBS表示方法以及三次NURBS曲线曲面反算算法；用微分几何理论推导了NURBS曲面的偏导矢及法曲率计算表达式；对曲面不同曲率特性区域的几何特征进行了深入分析，为建立复杂曲面的数控加工刀位计算模型奠定了理论基础。

There are three of them here, which is a normal number (you seldom get more than three with notebooks of this class), but they are not very conveniently placed.

有3人在这里，这是一个正常的数字(你很少获得超过3笔记本级)，但他们不是很方便放置。

The reason of unbalanced load voltage for station transformer in 220 kV substation was analyzed,the important influence of null line wirings in three-phase four-wire system on three-phase load voltage balancing was explained,and put forward a kind of simple,visual and practical vector analysis method.

分析一220kV变电站站用变压器负荷电压不平衡的原因，说明了三相四线制中的零线接线准确与否对负荷三相电压平衡性的重要影响，并提出了一种简单、直观的实用矢量图分析方法。

Optical parameters of GaInP were measured by using null ellipsometric spectrum method in the visible light region at room temperature The dependencies of refractive index and absorption coefficient for three samples on the energy of photons were obtained, and the result was analyzed and discussed The positions of energy gap of three samples were give

利用消光式椭圆偏振光谱法，在室温下可见光区对光电子材料镓铟磷的光学参数进行了测量，得到该材料的折射率和吸收系数随光子能量的变化关系曲线，并对结果进行了分析和讨论，给出了镓铟磷带隙的位

If this were our "lock" number then the two primes three and five would be our "key"; since both are prime and three times five is fifteen.

如果它是我们的"锁"数字，那么两个质数3和5就会是我们的密钥；因为这两个数都是质数而且3乘5是15。

The current coefficientΨ of correction includes many influencing factors. And numerical value of this coefficient varies widely. So the current method was improved from one coefficient to four coefficients in this paper. Three new coefficients of correction were considered to decrease composite ratio of coefficient Ψ and put forward three coefficients to modify calculating result.

针对现行经验系数包含的影响因素太多以致其取值过于离散的问题，在现行规范法计算建筑地基沉降的基础上，对现行方法进行了改进，由原来的1个修正系数改为4个修正系数，用新增加的3个系数反映3个不同方面的影响，以减小原经验系数的综合程度。

The Adiri Natural Nurser comes in three stages for three different flow rates.

Adiri奶瓶分为三个阶段，适合不同的流量。

The octagonal viewing cubicle holds three persons and can be lowered to a depth of three meters.

八角形的小观察室能容纳三个人，并且可以下降到三米的深度。

Three rebuilt programs which are ogee weir, maze weir and board-crest weir with controlled by gates are compared in technology and economy such as water discharge, flood level, structure safe stabilization and the project investment. At last, the maze weir program is best among the three ones.

通过对WES实用堰、迷宫堰、闸控式宽顶堰三个改建方案在泄流量、洪水位、结构安全稳定性、工程投资等技术、经济比较，综合评价选出迷宫堰方案为最优方案。

Add two to three drops of lemon essential oil into an air spray or add two to three drops into some water on your oil burner, to stop the spread of infection around your home.

在空气喷雾器里加2到3滴柠檬精油，或在燃油炉上加热的水中滴入2到3滴柠檬精油，能防止传染病的散播。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。