If the two level curves are tangent to each other that means they have the same tangent line. That means that the normal vectors should be parallel. Let me maybe draw a picture here.
如果两个等高线相切，说明它们的切线相同，也就是说他们的法向量应该平行，我再在这里画个图。
The auto power spectrum curves of the dry parallel reactor are obtained from the prototype dynamic test.
通过干式空心并联电抗器的现场原型动力试验，得到该电抗器各方向的自功率谱曲线。
Based on these characteristic curves, it proves that the moving stiffness of the designed Parallel Bonding Mechanism meets the working requirements of IC Chip Die.
根据这些曲线，说明所设计的并联焊头机构的动刚度能满足IC芯片粘片机的工作要求。
After analyzing kinematics and dynamic character 3-tpt parallel machine tool developed by Northeastern University by its simulation model constructed in ADAMS, kinetic and dynamic curves are obtained.
对东北大学研制的3 -TPT并联机床，分析了其约束链对机床运动及动力学特性的影响，并在ADAMS机械动力学仿真软件上建立了仿真运动模型。
It proves that the designed parallel bonding mechanism meets the working requirements of IC Chip Die by these characteristic curves.
根据这些曲线，说明所设计的并联焊头机构能满足IC芯片粘片机的工作要求。
Different functions are almost parallel distribution, and contact with each other with the change of the curves.
不同的功能近乎被平行分布，并在曲线的变化中相切。
The design principle is analysed for band-pass filters using three parallel coupled-lines and the related design curves are given.
本文分析了三线平行耦合线带通滤波器的设计原理，给出了有关设计曲线。
This paper discusses the principle of combination cam curves and its application in the paper feeder of die-cutting machine. It introduces the fundamentals of a parallel indexing cam design software.
本文通过拼接运动规律在平压模切机输纸机构中的应用原理的论述，介绍了一种平行分度凸轮机构设计软件的原理。
The parallel-connection and variable-speed operation characters of the centrifugal pump groups are studied by conics fitting of the character curves in the high efficiency area.
通过对离心式水泵高效工作区的性能曲线进行二次拟合，分析了离心式水泵机组并联调速运行特性。
By establishing the mathematical model of motion curve combination, this paper discusses the combination methods of parallel-indexing-cam curves in paper-feeding mechanism of die-cutting machine.
通过建立拼接运动规律的数学模型，论述了模切机输纸机构中平行分度凸轮运动规律的拼接方法。
By establishing the mathematical model of motion curve combination, this paper discusses the combination methods of parallel-indexing-cam curves in paper-feeding mechanism of die-cutting machine.
通过建立拼接运动规律的数学模型，论述了模切机输纸机构中平行分度凸轮运动规律的拼接方法。
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