The problem of attaining the tangent equation of a certain point on a quadratic curve is basically solved in plane analytical geometry.
平面解析几何对“求过二次曲线外的点所引曲线切线的方程”的问题，未给出一般的方法和公式。
The geometric curve of the irregular plane can be applied in the design of flower beds, the park or garden on the.
不规则的几何曲线平面可以应用在花坛、街心公园或庭院的设计上。
The paper describes the design of plane layout of ladder sleepers on curve sections with super-elevation and the method of installing super-elevation on curve sections.
阐述梯形轨枕在设有超高的曲线地段平面布置的计算方法，以及曲线地段超高的实现方法。
The expression of optic axial Angle and ray axial Angle on light wave plane can be obtained by using the curve equations of the wavefront of light wave and normal plane of light wave.
利用光波面和光波法线面的曲线方程，得出了光波面上光轴角和光线轴角的表达式。
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。
It is known that the projection of the intersection of quadrics with common plane of symmetry on this plane is a curve of second order.
具有公共对称平面的二次曲面的交线在该平面上的投影为二次曲线。
Programming by the plane curve unwrapped from the helix curve and cutting layer by layer, we created the variable pitch screw on the 3.5 axis NC milling.
文章基于3.5轴数控铣床，利用螺旋线展开的平面曲线编程，分层切削，加工出变螺距螺纹；
One is straight line or curve on the local plane. The other is the great circle flight path on the earth surface.
预定的飞行轨迹可以有两种规划方式，一是近似在当地切平面上的直线或曲线；
Based on the yield criterion and plastic potential theories, a plastic constitutional relation, yield condition and yield curve equation in plane strain for powder metallurgical material were derived.
粉末冶金材料屈服条件是粉末冶金材料广义塑性理论的基础，其数学表达式对粉末冶金材料广义塑性理论方法的建立有重要影响。
Based on the yield criterion and plastic potential theories, a plastic constitutional relation, yield condition and yield curve equation in plane strain for powder metallurgical material were derived.
粉末冶金材料屈服条件是粉末冶金材料广义塑性理论的基础，其数学表达式对粉末冶金材料广义塑性理论方法的建立有重要影响。
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