截线

Generally speaking, this resulting univariate equation has three real roots or has a real root and a pair of conjugate complex roots.

但根据参数化的过程是平面与拼接曲面相截获得交线后，再用平面与所得交线相截。

Forming principle of cone quadratic curved line is analyzed and result is given.

结果通过空间不同情况下圆锥截交线的坐标变换，获得了圆锥截交线的真实特征。

The first section is descriptive geometry, including basic knowledge of cartography and projection, projections of point, beeline, plane and their interrelations, projection transformation, curve, curving plane, the projection of curving plane solids, line of section, line of intersection, section and segmentation, elevation projection, dimetric projection.

第一部分为画法几何：其中有制图基本知识，投影的基本知识，点、直线、平面的投影及它们之间的关系，投影变换，曲线、曲面及曲面立体的投影，截交线与相贯线，剖面图与断面图，标高投影，轴测投影等。

For the purpose of this requirement, a wire crossing the imaginary plane more than once is treated as separate wires and the cross-sectional area of a wire having a non-circular cross-section shall be taken as the cross-sectional area of a circular wire having a diameter equal to the maximum width of the wire having the non-circular cross-section.

为了达 到这一要求，电线不仅一次通过这个假想面。计算横截面积时，散线或非圆截面的电线的横截面积等同于圆线的最大直径横截面积。

Position line error ; transferred position line ; running fix ; precision ; course made good ; distance made good ; intercepter method

船位线误差；转移船位线；移线定位；精度；推算航迹向；推算航程；截距法

The three-dimensional finite element analysis showed that the way of relatively proximal osteotomy changed the plantar pressure distribution obviously and made the center of pressure shift medially as normal.

三维有限元分析结果显示第一跖骨远端截骨手术后，静态站立状态下足部的压力中心向内移动，但随着截骨线靠近近端，压力分布改变明显，接近正常的足底压力分布状态。

Influence of skin effect and proximity effect must be considered both for phase line and neutral line if total harmonic distortion of current is obvious and the cross section of conductor is big.

不管是相线还是中性线，只要谐波电流的畸变率大，导线截面积大，集肤效应和邻近效应的影响就必须考虑。

Secondly, we investigate C°-flows on orientable closed surfaces having POTP, and obtain a necessary and sufficient condition of such flows.

剖析了这些轨道的邻域的轨线结构，还考虑了经过Poisson稳定点及几乎周期点的横截圈和相应的回归映射，其中本文讨论了可定向闭曲面上具有伪轨跟踪性质的C〓-流，得到了可定向闭曲面上C〓-流具有伪轨跟踪性质的较为简洁的充分必要条件；最后本文借助于从可定向的闭曲面到不可定向闭曲面的复叠投射，讨论了不可定向闭曲面上的C〓-流与其提升的轨线之间的联系，解决了不可定向闭曲面上C〓-流具有伪轨跟踪性质的判定问题。

Methods For gain optimal operation outcome,we used prolong carved mandible angle osteotomy by intraoral approach.we extended osteotomy line to mental nerve.and mental tuber was scoured,Augmentation chin or genioplasty was performed if the patient was subject to microgenia.

为获得更好的术后效果，我们采用口内入路下颌角弧形截骨术，将弧形截骨线延长到颏神经处，并对颏结节进行打磨，使截骨线延续流畅，伴小颏者同时行隆颏或颏截骨前移。

Designing of cross section profile of cutter is one of the necessary preconditions of realizing the CAD technique of special revolving tools.

端截形线设计是实现特种回转面刀具CAD技术的必要前提之一，本文以典型的特种回转面铣刀为例，给出了一种端截形线的设计方法。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。