tangent line

And the extension amount, extraction amount and tangent line stagger of the contact wire in the whole tensioning section can be obtained by calculation, and then the total reservation length of contact wire before cutting can be obtained thereof.

通过计算，求出整个锚段内接触线的延伸量、收缩量和直线拉出值，从而得出断线时接触线总预留长度。

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The slope of a line tangent to the curve at the point is the marginal function.

需求曲线在这一点上切线的斜率也就是该点的边际函数.

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By means of uniting geometry with algebra, the arc length, tangent line, cotangent space and curvature of curve in four dimensional space are investigated, and the corresponding calculation formula in each cases are given.

用形数结合的观点研究了四维空间中曲线的弧长、切线、法空间和曲率问题，并给出了其计算公式。

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And that line is tangent to the surface.

一条与曲面相切的直线。

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The steady automatic tangent line function has improved working efficiency.

稳定的自动切线功能提高了工作效率。

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The Tangent Line and Plane of Fractal Sets of Integral Dimension

整数维分形集的切线与切平面

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On a Tangent Line of Quadratic Curve By Only a Ruler

一根直尺作二次曲线切线的问题

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Locus of central point of the conic sections' segmental tangent line

圆锥曲线的切线段的中点轨迹

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Base circle : a circle tangent to the line of action ( or pressure line ).

基圆---与作用线 ( 或压力作用线 ) 相切的圆.

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Compressing air expands in nozzle, and then enters into vortex tube in the tangent line direction.

工作时压缩气体在喷嘴内膨胀, 然后以很高的速度沿切线方向进入涡流管.

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The existing algorithms include equivalent left and right curve angle by definition, normal section line method and tangent projection etc. But all their precisions are limit to one-order truncation error, and make severe accumulate error on discrete models.

有关的算法有根据定义的左右曲面角相等，法截面法和切向投影等。这些方法的精度都局限在一阶截断误差，在离散的网格上有严重的累积误差。

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Three Solutions of Tangent Line Rector of Space Curve Line

空间曲线的切线向量的求解方法

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The procedure used to define the derivative has a geometric interpretation which leads in a natural way to the idea of a tangent line to a curve.

微分的定义步骤有一个几何解释，最简单的观念就是一条曲线的切线。

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During digitizing, the adaptive sampling planning method based on the curvature of surface and the slope of tangent line of measured point is proposed.

在曲面数字化方面，提出基于曲面曲率和被测点切线斜率的自适应采样规划。

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The purely kinematical equation for the tangent vector of a line element is derived.

导出了线元切向量的变形方程以及拉伸轴在极射赤面投影图上位置变化计算公式。

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In order to calculate the intensity of general-stress in tri-axis test in geotechnical investigation, the author uses cartesian geometry principle to derivate calculation functions of common tangent points coordinates of every circle by the common tangent line. Especially, the slope tangent line is calculated directly.

工程勘察三轴试验的总应力强度指标的计算，运用解析几何原理导出任意两个应力圆公切线切点坐标计算公式，尤其是直接计算切线斜率。

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The mathematical equations of theoretical contour of cam and its tangent line and normal line were derived.

推导出了凸轮理论廓线及其切线与法线的数学方程；

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Study of Solving Normal Line and Tangent Plane of Archimedes Helicoid Based on MATLAB

基于MATLAB的阿基米德螺旋面法线和切平面的求解研究

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