central symmetry是什么意思

用法例句

This paper discusses a method of central symmetry calibration for upgrading and repairing of surface warship.

以某型导弹驱逐舰中修及现代化改装为例,较为深入地探讨了水面舰艇现代化改装或修理过程中 中线面的校核方法。

The switching power supplies of capacitive loading with no operating frequency transforner, are generally used in modern host computers and peripheral equipments, there are special requirements of the switch and midline of power supply systems.

由于容性负载对供电系统的开关、中线有特殊要求,为了保证计算机系统长期、可靠地运行以及机房的安全,本文介绍了计算机房供电系统的合理布线和维护方法。

Two Inequalities for the Medians and the Symmedians of a Triangle;

涉及三角形中线与类似中线的两个不等式

The R-r-s method of triangle inequality is employed to prove the conjecture of a triangle inequality proposed by the author many years ago,which is the reciprocal inequality for median ma,mb,mc,the circumradius R and the radius of the inscribed circle r:1/ma+1/mb+1/mc≤2(1/R+1/r)/3.

采用三角形不等式中R-r-s方法,证明了作者多年前提出的一个有关三角形的猜想不等式,即有关中线ma,mb,mc与外接圆半径R以及内切圆半径r的不等式:1/ma+1/mb+1/mc≤2(1/R+1/r)/3。

The important method of R-r-s is used to prove the inequality chain for the medians altitudes and radii of exinscribed circles of a triangle:Let ma,mb,mc denote the medians of the triangle ABC;the altitudes ha,hb,hc;the radii of exinscribed excircles ra,rb,rc;then holds maha+mbhh+mchc≥wbwc+wcwa+wcwa≥hara+hbrb+hcr.

应用重要的R-r-s方法,证明了有关锐角三角形的中线、高线与旁切圆半径的不等式链:设锐角ΔABC的三条中线,三条高线与旁切圆半径分别为ma,mb,mc;ha,hb,hc和ra,rb,rc,则成立不等式:maha+mbhb+mchc≥wbwc+wcwa+wawb≥hara+hbrb+hcrc。

The function of neutral line in Y connection of asymmetric loads;

中线在不对称负载作Y连接时的作用

The quality of the neutral line and its grounding will influence directly to the operation of the combined hi-frequency switching mode power supply.

交流供电线路中的中线及中线接地质量的好坏,对通信用高频开关组合电源的工作有直接影响,实际应用中经常出现因中线及中线接地故障造成设备损坏,因此需加强对中线的维护。

Because of action of the nonlinear load,a large number of third harmonic component would exist in the neutral line current.

由于非线性负荷的作用,可使中线电流中含有大量的3次谐波分量。

The antithetic formula of Finsler-Haduiger inequality related to the central lines and central planes area of the n-simplex;

联系n维单形中线、中面面积的Finsler-Haduiger不等式的对偶式

How to decide the direction of central line of the discus ground;

如何确定掷铁饼场地的中线的方向

The papor first introduces the key application of General Total Station,then emphatically expounds the method and formula of coordinate calculation of road central line,grade separation turn-to-turn central line,abutment central point and axial point of reference Thus the concrete operation of General Total Staion in highway construction layout is clarifie

首先介绍全站仪的基本含义 ,提出了全站仪应用于公路施工放样的关键 ,着重论述道路中线桩坐标、道路立交匝道中线桩坐标及桥墩、台中心和桥涵轴线控制桩坐标计算方法 ,并给出了计算公式。