Methods: The length of cervical spinal curving strings and arcs were measured on middle potential lateral radiographs in 378 normal persons cervical spines by computer imaging processing system, and the physiological curvature were figured out through solution of dualistic once equation.

Case of Teaching about the Application of Binary Linear Equation Group

初中代数教学中的数学情境与提出问题&二元一次方程组的应用教学案例

Configuration feature: Constant green undershrub, its individual plant can amount to 1 meter high.

形态特征: 常绿小灌木, 其株高可达1米.

Introduced the work flow and database design of the system, took the quadratic equation with one unknown in math course of middle school as an example and demonstrated the study diagnosis process under the two models.

介绍了系统的工作流程和数据库设计。以初中数学中的一元二次方程章节为例，演示了系统在两种模式下对学生的知识状态进行诊断测试的过程。

After deriving Swt from the model, we find out that the water saturation equation is a quadratic equation about Swt, so its solution is very simple and obtained by using the standard quadratic-root formula.

通过研究混合泥质砂岩有效介质通用HB电阻率模型的求解方法，表明模型导出的关于S（wt）的方程是一个一元二次方程，可用求根公式求解，解法非常简单。

The method solves an algebraic equation instead of a set of nonlinear differential equations to find the two initial conditions for the periodic relative rotating orbits for any eccentric orbit with nonlinear relative motion.

该方法不用求解非线性相对运动微分方程，只需解一个一元二次代数方程，就可给出任意偏心率和非线性条件下，两个具有明显物理意义的周期性相对运动初始条件。

The Properties of the Real Root of Equation of One-place 2-th Order

含参数一元二次方程根的性质

Based on single quadratic equation of nitrogen, phosphorus and potassium under suitable fertilization rate, the optimum amount of N fertilizer among years had significantly increasing trend, the one for P fertilizer increased and K fertilizer with a slightly increase.

据适宜施肥条件下水稻氮、磷、钾单因素一元二次肥效方程分析，氮肥最佳施用量呈逐年显著增加趋势，钾肥最佳施用量有所上升，磷肥最佳施用量缓慢增加。

In the first one of them, the equation to calculate the phase shift between two adjacent frames is deduced by solving a monadic quadratic equation and then the arbitrary unknown phase shift can be calculated by using the two interferograms and the intensities of object and reference waves.

其一是通过求解一元二次方程，推导出相邻两幅干涉图之间相移量的计算式，由相邻两幅干涉图和物光及参考光强度计算任意未知相移量。

This paper demonstrates how teachers instruct students to study the change and processing of mathematics problems.

文章通过对一元二次方程的演绎，展示教学过程中教师如何引导学生研究数学问题的变化与发展过程。

Conclusions The quadratic model is fit for the curvilinear relationship of the migration length to radiation dose.

结论一元二次方程可以很好反映淋巴细胞DNA断片迁移长度与γ射线照射剂量之间的量效曲线。

The relation between the cumulative release amount of cadmium with the leaching amount could be described with mono basic quadratic equation.

镉累积释放量与淋溶量的关系可用一元二次方程描述。

Analysis on Some Common Errors in Solving Quadratic Equations

有关一元二次方程问题的误解剖析

One Variable Quadratic Equation of Expulsion Coefficient from Source Rocks and Its Application

烃源岩排烃系数的一元二次方程及其应用

In this paper, the author gives the formula of roots of a quadric equation over a field of2 k elements and presents the problem.

利用一元二次方程的求根公式构造二元二次方程组的迭代算法，通过图解二元二次方程组的解来说明迭代算法在实践中的应用。

It overcomes the disadvantages of existing distortion calibration approaches. Assumed only with one order radial distortion, image coordinates of only 4 special collinear points are needed as well as the cross ratio of them.

该方法利用了透视投影中的交比不变性质，在畸变模型为一阶径向畸变的情况下，只需要空间共线的4个点的图像坐标和其交比，建立一元二次方程即可标定畸变参数。

New irrigation and undersoil heating systems were also installed at the same time as the 2003 work.

在2003年的那次大修中,新的灌溉系统和地热系统也被安装上了.

Many analysts consider below-average volume as a negative, because It'suggests a lack of eagerness.

许多分析师认为,交易量低于平均水平不是件好事, 因为这显示投资者缺乏买进的迫切愿望.

She is often angry at her son because his performance in school is always below average.

她儿子在学校的成绩一直很差,这总是让她非常生气.

Harry is below average in his lessons and Jim about up to average.

哈利的功课在中等以下,吉姆的功课刚达一般水平.

Children are banded as averageaverage and below average.

入学儿童按好、中、差三等编班.