等差级数

1-4-7-10-13是一个等差级数的开始部分。

1-4-7-10-13 - is the start of an arithmetic progression .

（数学）其倒数构成一个等差级数的级数术语。

( math ) a progression of terms whose reciprocals form an arithmetic progression .

寻找石油的等差级数是严格的。

The arithmetic searching for oil is stark .

视力记录视标每增加1行，记录相差0.1，呈算术等差级数排列。

The record difference was 0.1 with the increase of every line of the sight mark , it showed arithmetic progression arrangement .

常见的不作偏移，即对其背后岩石凹凸不平的混凝土结构物作厚度曲线，或在时间剖面上用等差级数的深度纵坐标，有基本概念的问题。

It is questioned that thickness curves of concrete structures having uneven surface are directly derived without migrate , and depth is taken directly from ordinate in arithmetic progression .

本文提出了一元线性回归的自变量在等差级数的基础上进行双向黄金分割，提高了两端点观测值的多余观测分量，缩小了观测值之间多余观测分量的差异。

This paper proposes a bidirectional golden section based on independent variables according to arithmetical progression , which increases the redundant observations of the observations at both endpoints and narrows the difference of redundant observations among the observations .

以土耳其头轧制椭圆管孔型各变形边长度不变的原理作为设计孔型的依据，各架次的变型量按等差级数递减，可以得到较好几何尺寸精度和表面质量的成品椭圆管。

The better dimension accuracy and surface quality of finished ellipse pipes can be available if the deformed value of each layer is confirmed by equal difference principle based on equal length of deformed sides as pass design principle .

光弹性等差条纹级数的识别

Recognition of Photoelastic Isochromatic Fringe Order

在光弹性试验中，由于各种不利因素的影响，往往不能精确测得等差线级数。

In photoelasticity experiment , it is usually difficult to measure the series of equidifferent line precisely due to various factors .