直纹

Durable straight-grained wood of the lacewood tree; used for building and cabinetwork and tools.

耐用、直纹的枪木树木料，用于建筑和细木工及制工具。

In this paper,the B-spline curve is supposed as boundary curves,when they are in two paralled plane and two arbitrary plane,the condition about the control vertex of characteristic polygon when the ruled surface is developable are gained,solved the designing problem of degree and degree B-spline curve .Throughing (2,3) degree and (2,2) degree B-spline ,we haveproved the validity and utility of this method.

本文用两条B样条曲线作边界曲线，当它们位于两平行平面上和两任意平面上时，研究得到了由它们形成的直纹面为可展面时它们的特征多边形顶点满足的条件，解决了(n，n+1)次和次可展B样条曲面的设计问题，然后以(2，3)次和(2，2)次B样条曲面为构造实例，证明了该算法的正确性和实用性。

On the basis of Aumann,Meng Ya-qin and Ye Zheng-lin[13],Cuan-ying and Xue Ji-jun[16] have gained some conditions about characteristic polygon of the ruled surface,they used two Bezier curves in paralled plane as boundary curves to get ruled surface.

国内孟雅琴、叶正麟、爨莹、薛继军等人在Anmann方法的基础上，用位于两平行平面上的两条Bézier曲线作边界曲线，形成直纹面，并得到了它们可展时特征多边形顶点应该满足的条件。

In wire-cutting manufacturing of the top and bottom different curve,accomplishing cutting way of ellipse bias changing curved surface which between two plane curve into developable surface in order to calculate NC program of four axis ganging.

在上下异型工件的线切割加工中，宜采用椭圆偏置切割法，即将上、下两平面曲线间的曲面变成可展直纹面，进而计算四轴联动的数控程序，可保障加工的效率与效益。

At the same time, the thin straight lines of the setting of the eyes, and the thin straight lips, and the markings in the nose, curved with a sarcasm that looked handsomely diabolic .

同时他眼圈边细微的直纹和鼻上的小窝也都带着嘲讽弯了起来，使他看去带着点漂亮的魔鬼味儿。

In the case of kod≥0,we prove that s≥6,and construct a series of examples of s=6,where S is rational surface,elliptic ruled surface,Abel surface,K3 surface,Enriques surface,biellipticsurface respectively.

当〓时，证明了〓。并且找出了s=6的一系列例子，曲面类型分别为有理曲面，椭圆直纹面，Abel曲面，K3曲面，Enriques曲面，双椭圆曲面。

Based on the CAD software UG, the models of centrifugal fans with ruled-surface impeller versus with enveloping surface impeller are developed.

首先本文采用CAD软件UG对直纹面叶轮离心通风机和包络面叶轮离心通风机进行了整体风机三维流场建模和单个叶轮通道的流场建模。

But the ruled surfaces in R^3 or R(superscript 3 subscript 1) have vanishing Gauss curvature if and only if they are developable.

这与低维情形绝然不同，在R^3或R(上标 3 下标 1)中只有当直纹面是可展时，高斯曲率才为0。

We have proposed a novel method to extract ruled surface from mesh model.

提出一种基于直母线族提取与拟合的网格模型直纹面提取方法。

Manual cutting machine, straight strap and 45-degree diagonal straps machine suitable for cloth, adhesive-bonded fabric, tent, umbrella, sponge foam, leather, reflective material, plastic, paper, two-side glue, acetate fabric, reinforced belt, conductive cloth, copper, foil and other materials of various width straight.

手动切捆条机及直纹，45度斜纹卷布机适用于布料，无纺布，帐篷，雨伞，泡棉，皮革，反光材料，塑胶，纸张，双面胶，醋酸布，补强带，导电布，铜箔等材料各种宽度直条，45度斜条的卷布及裁切。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。