当然也有另一种方法，就是用参数方程表示这两条直线，用两条直线的方向向量作外积，从而得到切平面的法向量。
Another way to do it, of course, would provide actually parametric equations of these lines, get vectors along them and then take the cross-product to get the normal vector to the plane.
本文导出了平面螺管几何参数之间的关系及换热准则方程，并对这种换热器进行了设计计算和特点分析。
The relations between the geometric parameters, as well as the heat transfer criterion equations, of the plane spiral-tube are derived.
以位置约束方程奇异性条件和结构参数空间复形剖分方法为基础，研究了平面机构尺度分类问题。
Based on singularity of constraint equation and complex division of structure-parameter-space, the dimension classification method of planar mechanism was researched.
本文提出用周期波导的方法，分析平面阵列波导光栅模式参数及其本征方程。
In this thesis, the AWG's transverse-mode parameter and its eigen equation as well is analyzed based on the periodic waveguide method.
给出主参数共振系统参数平面的分岔集和幅频响应方程的分岔图。
The bifurcation diagrams of the parameter plane and the response equation are obtained.
基于平均方程，得到了参数平面上的转迁集，这些转迁集将参数平面划分为不同的区域，在各个不同的区域对应于系统不同的解。
Based on the averaged equation, the transition boundaries are sought to divide the parameter plane into different regions, corresponding to different types of the solutions.
导出了带无限多个参数的有根平面植树和平面树的色和方程的精确表达式。
The explicit expressions of chromatic sum equations for rooted planted trees and planar trees with infinitive parameters are derived respectively.
关于平面凸轮廓线设计，现有文献中推出的凸轮廓线方程式，一般均是以凸轮转角为参数的函数。
In the design of plate cam profiles, the cam profile equation generally takes the angle of cam rotation as the independent parameter.
从由曲线普通方程求平面图形面积的公式出发推出在各种情形下由曲线参数方程求平面图形面积的公式。
From commonly used equation of calculating plane figure quadrature, formulas of calculating plane figure quadrature by applying curve parametric equation can be deduced.
根据运动方程，求得釉浆在搪瓷制品的倾斜平面上薄膜流动方程，以及搪瓷釉浆流变特性参数对薄膜流动的影响。
The expressions for the volume flow rate and thickness of enamel slip film flowing along an inclined plane have been obtained.
本文以斜平面二次包络环面蜗杆副为研究对象，在空间啮合理论的基础上，推论出三参数修正的啮合方程、接触线方程、蜗轮齿面方程。
In this thesis, planar double-enveloping worm gear pairs is the research object, combined with space Meshing theory, derived from the multi-parameter modification of the mesh equation.
本文阐述了平面二次包络弧面蜗杆传动的几何特征，引用数学方程对这些特征加以说明，进而提出了啮合参数选择原则。
In this paper, the geometric characteristics of worm drive with double enveloping arc surface machined by datum-plane tool are stated.
从由曲线普通方程求平面图形面积的公式出发推出在各种情形下由曲线参数方程求平面图形面积的公式。
The cube formed after cutting one part off the same planar graph in different ways of motion and its method of calculation are introduced.
从由曲线普通方程求平面图形面积的公式出发推出在各种情形下由曲线参数方程求平面图形面积的公式。
The cube formed after cutting one part off the same planar graph in different ways of motion and its method of calculation are introduced.
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