Key points: application of the direction vector of a line and the normal vector of a plane.
重点：直线的方向向量与平面的法向量的应用。
The Angle between a linear feature and a horizontal line in a vertical plane containing both lines.
一个直立的平面内介于一线性特征与一条水平线之间的角度。
Solutions to problems in descriptive geometry such as finding the relative positions between straight lines between a straight line and a plane, and between planes are found by computerized graphics.
本文介绍用计算机求解画法几何中直线与直线、直线与平面及平面与平面的相对位置问题的方法和程序设计。
The intersection visibility rule of a line and general plane was concluded and a new judge method on intersection visibility of them was also put forward in this paper.
它与用重影线法求直线与平面相交交点相结合，为直线与平面相交直线可见性判断提供了一种新方法。
The paper evaluates the limitations that semielliptical surface crack in a shaft is simplified to a unilateral crack in a finite boundary plane and a cross straight line crack in a semi infinite body.
评价了将轴表面半椭圆裂纹简化为有限边界平板的单边裂纹问题和半无限体表面穿透直线裂纹问题来处理的局限性。
A plane curve formed by the locus of points equidistant from a fixed line and a fixed point not on the line.
最大食分曲线为所有点的轨迹，在那些地方，在给定的时间里达到最大食分。
If the normal section in the center of the tooth line is taken as a tooth measuring and design section, when spline hob is designed in a plane meshing, the tooth profile error is minimum.
如果以齿纹中点法剖面作为齿形检测和设计剖面，用平面啮合法设计花键滚刀时，则齿形误差最小。
In this paper, the author gives the vector expression of the symmetric figure for a point, a straight line and a plane, and its application.
本文给出了点、直线、平面相互间对称图形的向量表达式及其应用。
This paper expounds the use of an auxiliary plane in seeking the point of intersection between a straight line and a plane, using a comparative analytical method.
采用对比法对辅助平面在求一般位置的线面交点中的作用进行了论述。
The art of calligraphy shows a process reflecting and concretizing a solid line on a two dimensional plane in a period of time. This kind of visual art also has the traits of the art of the time.
书法艺术在二维平面上表现和凝固了一根立体线条在时间里的一段流程，因而这一视觉造型艺术兼有了时间艺术的一些特点。
The intersection visibility rule of a line and general plane was concluded and a new judge method on intersection visibility of two general place planes was also put forward in this paper.
同时，阐述两平面相交交线的空间位置情况，从而得出两平面相交可见性判断的新方法。
By inserting a slot at the edge of the rectangular slot on the ground plane and loading a C-shaped resonator near the microstrip line, dual band-notched characteristic at the central frequency at 3.
通过在地板上的矩形槽的边缘开槽和在馈线旁加载C形谐振器，该天线实现在中心频率3。
The specimen with different direction, with the field or a magnifying glass to see a group of parallel dark and straight line or a line or plane appears on the cleavage plane until it is twin.
将标本向不同方向旋转，直到用野外或放大镜看到晶面或解理面上出现一组平行的明暗相间的直线或折线，这就是双晶纹。
To avoid such interference in a line array, a special adapter between the driver and the horn must be devised to produce plane waves.
为了避免声干涉，线性阵列改变了传统的结构，在号筒和驱动器之间做了特殊的设计，更有效于发出平面波。
It is presented that the locus of a line crossed with each of two guide line and a guide conic not being on a common plane is a ruled surface of fourth order.
本文提出了由一条二次曲线和与该二次曲线不共面的两条异面直线为导线，与该三导线均相交的直线轨迹是一个直纹四次曲面，并讨论了二次曲线分别为椭圆、双曲线和抛物线时，形成的曲面的形状特征。
It is presented that the locus of a line crossed with each of two guide line and a guide conic not being on a common plane is a ruled surface of fourth order.
本文提出了由一条二次曲线和与该二次曲线不共面的两条异面直线为导线，与该三导线均相交的直线轨迹是一个直纹四次曲面，并讨论了二次曲线分别为椭圆、双曲线和抛物线时，形成的曲面的形状特征。
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