principal section

The arc current and arc voltage are the input of the electrode controller which is the principal section of the electric arc furnace control system. It is the premise of assuring the normal working of electrode controller that arc current and arc voltage are measured accurately.

电弧电流和电弧电压是电弧炉控制系统最重要环节电极控制器的输入，精确测量电弧电流和电弧电压是保证电极控制器正常工作的前提。

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Principal Plane of Ray and principal Section of Crystal

光线的主平面和晶体的主截面

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This paper puts forward a problem in crystal optics teaching which merits our attention: principal plane and principal section are two different physics concepts. The two concepts cannot be confused, nor be neglected in teaching.

本文提出了晶体光学教学由一个值得注意的问题：主平面与主截面是两个不同的物理概念，两者不能混为一谈，在教学中也不能有所偏重。

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The shape of the principal section evidently controls the positions of the orebodies, and the orebodies mainly appear in places where the attitude of the section varies.

主断面的形态明显控制矿体赋存部位，矿体主要赋存于断裂产状变化部位。

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A Study on the Walk-Off Angle in the Optical Indicatrix s Principal Section of Uniaxial Crystal; Luminaire designed to be suspended from a cable with its main beam axis at right angles to the axis of the road.

单轴晶光率体主截面内离散角的研究利用电缆进行悬挂的灯具，其主光轴与道路主轴成直角。

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A section of a metrical period in quantitative verse, consisting of two to six feet and in Latin verse having one principal accent. Italian words usually have the main stress on the penultimate syllable in the word.

言词的节奏单位，拉丁诗歌中从两个到六个音步中，含有一个主重音意大利语单词的主重音通常在倒数第二个音节上。

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The refraction of e beam within the principal cross section of a uniaxial crystal studied by computer assistance

单轴晶体主截面内e光折射角和阵面角的计算和作图

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A Way of Delimiting Propagation Direction of Extraordinary Ray in the Principal Section

确定主截面内非寻常光传播方向的一种方法

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Analyses have been made on the principal aspects of high pressure CO2 laser. Several modern preionization techniques have been assessed. In order to develop a high-pressure CO2 laser of high energy output and large beam cross section, the X-ray preionization techniques are more potent.

对高气压CO2激光器的基本情况作了分析，评价了几种现代常用的预电离技术，认为在发展大能量、大束截面的高气压CO2激光器中x光预电离技术是较有潜力的。

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Public vehicle, especially the impact of the big and middle buses, is 40% in the total traffic capacity in Lanzhou, which is becoming the principal and important section. So the public transport of regular time and route is chosen and analyzed.

兰州市区交通量构成中公共交通车辆占到40%，交通对环境的影响在很大程度上是公共交通造成的，其中大中型车辆的影响更加明显，所以选择定时定线公交系统进行分析。

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