子午线

Abstract］ Objective To describe the shape of the planar space of the corneal anterior surface of children with emmetropia by using a conic section, and then to plot the changes in asphericity on 36 meridians to deduce the formulae of the three-dimensional shape of the corneal anterior surface.

目的 通过二次曲线方程来描述正视儿童角膜前表面的二维空间形态，根据各子午线非球面性的变化规律推导出其三维形态的数学表达式及非球面性变化规律表达式。

It was evidenced that the rolling-pass of the Mannesmann rolls is non-linear and the non-linear barrel-shaped rolls are unfavourable for further increasing the production capacity with high effeciency and improving the tube quality.

为了发展我国钢管制造技术，我们从1975年起研究折线轧辊下的变形区，给出它的曲面方程式和子午线方程式，证明了变形区是非线性的。

By parameter(tower total height, shell thickness, meridional curvature) analysis of cooling-tower natural frequency, we find that, the basic natural frequency of cooling tower is sensitive to the top meridional curvature, an approximate formula is proposed based on the parameters, which can estimate the basic natural frequency of cooling tower.

通过对冷却塔自振频率的参数分析，如塔体整高、塔壳厚度、子午线曲率等，发现基础频率对上部子午线曲率较为敏感，并给出了用于估算大型双曲冷却塔基础频率的三参数公式。

LLYB1750×4600×2 Hydraulic Tire Curing PressLLB1170×1750×2g Tire Curing PressLLB1665×3340×2 Tire Curing Press MachineLLB2235×10395 Tire Curing PressAPI Gate Valve:150Lb900Lb 2''16'',Globe Valve:150Lb600Lb 2''8''Metal Seated Ball Valve Q41F PN1.64.0MPA DN25200mmWafer Butterfly Check Valve Butterfly Valve:D71F,D371F , D341H PN1.62.5MPa DN501000mm.

LLYB1750×4600×2液压轮胎硫化机LLB1170×1750×2G子午线轮胎硫化机LLB1665×3340×2子午线轮胎硫化机LLB2235×10395L轮胎硫化机API闸阀：150Lb900Lb 2''16''截止阀：150Lb600Lb 2''8''金属密封球阀Q41F PN1.64.0MPa DN25200mm对夹蝶式止回阀D71F，D371F D341H PN1.62.5MPa DN501000mm。

Any place to the left of thr Prime Meridian is in the Western Hemisphere,while any place to the right of the Prime Meridian is in the Eastern Hemisphere.

在本初子午线左边的地方叫做西半球，当一些在本初子午线右边的地方是在东半球。

The angular distance on the earth's surface, measured east or west from the prime meridian at Greenwich, England, to the meridian passing through a position, expressed in degrees, minutes, and seconds.

经线：地球表面的成角距离，从英国格林威治的本初子午线向东或向西至经过某一点的子午线计量，以度、分和秒表示。

Angular distance on the earth's surface, measured east or west from the prime meridian at Greenwich, England, to the meridian passing through a position, expressed in degrees, minutes, and seconds.

经线地球表面的成角距离，从英国格林尼治的本初子午线向东或向西至经过某一点的子午线计量，以度、分和秒表示

According to the International Meridian Conference, the new millennium began when it was midnight in Greenwich, south-east London, the site of the original Greenwich Royal Observatory, where the "prime meridian"(0 longitude) is located.

根据&国际子午线大会&的决定，新千年开始时，伦敦东南部的格林威治，原格林威治皇家天文台、&本初子午线&(0经度)的所在地正是午夜。

The cross cylinderis a compound lens having a net minus power in one principal meridian and an equal net plus power in the other.

12交叉圆柱透镜(Jackson 交叉柱镜)是一组复合式镜片，一条主子午线上有单纯负圆柱透镜焦度，在另一主子午线上有一相等的单纯正圆柱透镜焦度

Along the celestial equator from the observer's ''.

从观测者所在的子午线到给定天体的子午线沿着天赤道的角''。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。