查询词典 line pencil

Accoring to the polar theory of conic section, the characteristics of geometrical graphics concerning the conic section is discussed from following three aspects:the conbination of Point and line, harmony of point range and pencil of line , trace of point and enveloping of straight line.

本文根据二次曲线的配极理论，从点、线的结合性，点列和线束的调和性，点的轨迹和直线的包络三方面研究与二次曲线有关的几何图形的性质。

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

Exhibits: Automatic Cyclograph, Automatic Fiber Pen Line Ograph, Automatic Globoidal Lineograph, Automatic Penpoint And Ink Detector,Automatic Pencil Detector, Etc.

展品：书写划圆仪，纤维笔画线仪，弧面划线仪，笔头墨水检测仪，铅笔检测仪器…等

He is drawing a line on the paper with a color pencil.

他正用一支色笔在纸上画线。

The series are using for flat glass grinding, and parallel straight line pencil edger rough grinding,fine grinding and polishing finishing at one time.

该系列产品适用于对平板玻璃的磨边加工，可同时对玻璃的两条平行直线圆弧边的粗磨、精磨一次加工完成。

Line pencil ; projective comespondence ; conic

线束；射影对应；二次曲线

The line pencil equation for geometric elements in En is studied. From the direction number in the equation, the relative position between the elements and the projective space anp that between any two elements are analyzed.

本文系统地研究了E~n中几何元素的线束方程，由方程中的方向数分析几何元素对投影空间的相对位置和几何元素间的相对位置，规律性强。

When the pencil wants to draw a line,the ruler often help it draw the line.

当铅笔想画一条直线时，尺子就来帮它画。

When the pencil wants to draw a straight line, the ruler often helps it draw the straight line.

当铅笔想画一条直线时，直尺帮助它画。

I then made a pencil line around the bow where I wanted the new scribe line to be.

当时我提出了铅笔线靠近船头的地方我希望新的刀线。

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。