查询词典 plane curve

Theorem The arc length of a plane curve which is smooth can be calculated.

定理 光滑曲线弧是可以求长的。

"Cardioid:a heart-shaped plane curve, the locus of a fixed point on a circle that rolls on the circumference of another circle with the same radius."

心脏线：一种心形的平滑曲线，圆周上一固定点绕另一具有相同半径的圆的圆周转动的轨迹。

They are ①cubic plane curve constituted with projective pencil of lines and line eonic

进而证明三个定理：①一次线束和其射影对应的二次线束，所对应直线交点的轨迹为三次平面曲线

Therefore at each time we get the roots of this cubic equation, we can decide if we keep or reject each root according to the continuity of the curved surface, the method is as follows: If , the relative cubic plane curve is just a circle, this circle can be gotten by solving .

因此在每次求得该一元三次方程的解时，我们根据曲面的连续性来判断这些根的取舍，方法如下：在处，所得的平面曲线就是圆截线，该圆截线可以由相截得到，即。

As we known, the total curvature of a simple closed plane curve γ is ±2π, that is,∫γ kds =±2π, from Cauchy-Schwarz's inequality, one gets that We will use Minkowski's support function to study the stability of the above

我们将利用Minkowski支撑函数，在Hausdorff距离的意义下研究这一不等式的稳定性。

In this paper, the authors introduce a method of calculating transverse sight distance of a random point which belongs to plane curve.

提供了计算弯道平曲线上任意一点的视距横净距的计算方法，并在 Windows操作系统下编制了相应的计算程序。

A plane curve everywhere equidistant from a given fixed point, the center.

圆，圆形从定点等距离到任一点的平面曲线

A helicoidal surface in Minkowski 3-space is defined as the orbit of a plane curve under a screw motion.

三维Minkowski空间中的螺旋面是一条平面曲线经由螺旋运动所生成的曲面。

With the help of .NET platform, C# Language is used in secondary development of AutoCAD. That is to realize automatic skeletonizing of highway horizontal alignment giving the coordinates of beginning point and ending point as well as crossing point′s basic information. The research fruit can be applied in the software of plane curve.

在。NET平台下，采用C#语言进行AutoCAD二次开发，即在给定路线起终点坐标与交点基本信息的基础上实现路线平面线形的自动绘制，此研究成果完全可以被平面曲线设计软件所利用。

Originally the plane in such contexts was imagined as flat,hence the choice of the wordplane; in practice this surface to curve slightly in order to work.

起初，在这些上下文中的机翼被想象成是平坦的，因此选用了单词plane；实践中为了运行机翼表面稍微有些弯曲。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。