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

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.

It's obvious the products are below average quality.

很明显,这批产品地品质是中下水平.

The snowfall this month is below average.

该月的降雪量低于平均水平.

Their language development is below average.

他们的语言能力的发展低于一般水平.

The riders , aged 27 to 44, began with slightly below-average bone density.

这些年龄在27-44岁间的赛手, 比赛开始时的骨密度都稍微低于平均值.

Remember, half the people you know are below average.

永远记住: 你认识的人中定会有一半居于平均线以下.

These marks are well above / below average.

这些分数远在一般水平以上[以下].

The amount of snow this year has been below average.

今年的降雪量低于平均水平.

The brushes have bristles of animal hair, with a very fine point.

毛笔用动物的毛发制成, 笔尖很细.

This pen has a fine point.

这支笔的笔尖细.