1) choice of section of lead
导线截面的选择
3) cross-section selection
截面选择
1.
This paper illustrates that there are an internal force analysis and a cross-section selection as two key links in steel-truss design, and it has put forward several questions that should be paid attention to in the design.
本文阐明了桁架设计中的内力分析和截面选择两个关键的环节,并且提出了在设计中应注意的几个问题。
2.
Several methods of cross-section selection of N Line,PE line and PEN line in the architectural distribution system were introduced.
介绍了建筑配电系统中的中性导线、保护导线和保护中性导线的截面选择的方法。
4) section selection
截面选择
1.
The paper gives a brief introduction of the advantages of the steel scuttle,and introduces the headwall of the steel scuttle,the section selection of the stiffener,the calculation deflection and strength,the common forms and calculation of the scuttle bearing,so as to extend the application of the steel scuttle in the coal buffer bin of the main power house of the thermal power plant.
简述了钢煤斗的优点,对钢煤斗的斗壁和加劲肋的截面选择及挠度、强度核算,煤斗支座常用形式及计算进行了简明扼要的介绍,以推广钢煤斗在火力发电厂主厂房煤仓间的应用。
5) state-selective cross section
态选择截面
1.
The measured state-selective cross sections agree with the semi-classical close-coupling calculations,but have some deviations from the results of photon emission measurement.
利用冷靶反冲离子动量谱仪装置系统研究了20—40keVHe2+-He碰撞体系的态选择单电子俘获过程,实验获得了单电子俘获过程的态选择截面以及角微分截面。
6) wire cross-section area
导线的截面积
补充资料：输电线路导线截面选择
输电线路导线截面选择
selection of conductor cross-section of transmission line
但由于超高压输电线路导线的表面电场强度均控制在电晕临界电场强度的80%以上，接近于电晕临界电场强度，而新架设导线表面的局部污损又导致导线电晕临界电压降低，故运行初期和在雨天情况下仍难免出现电晕。相导线上产生电晕放电时，要伴随着产生连续重复性的电流脉冲，这些电流脉冲产生频率为0.15~100 MHz的振荡电磁波，致使在电晕导线上产生高频电磁辐射，从而在导线周围形成一高频电场，对无线电收音机和发射天线产生干扰。同时这种振荡电磁波还沿导线传播，干扰高频通道的正常工作. 由电晕导线产生的无线电干扰电平L-20 19(EZ/E，)，dB。其中EZ为测点电场强度，拌V/m;E，为参考电场强度，拌V/m。工程上取E，一1拌V/m为基准，故L~20 lgEZ。若EZ~El~1拜V/m，则测点的无线电干扰电平为零。 从高压、超高压架空输电线路下测得的无线电干扰电平L(dB)随频率f(MH:)的增大而减弱，其关系曲线称为频谱特性，如图2所示。由频谱特性看出，频率在0.15~1.0 MH:范围内的干扰电平最大;雨天的干扰电平是各种气候中最大的。另外，随着海拔高度的增大，相对空气密度减小，干扰电平也增大。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条