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The deviation factor of natural gas is a great significant parameter for the gas reservoir engineering calculation,which is mainly obtained by the Standing-Katz graphic solution or empirical formula calculation.

天然气偏差因子是气藏工程计算中一项相当重要的参数，多采用Stand ing-K atz图版或经验公式求取，其中图版法人工读值误差较大且不便于计算机应用，而各种经验公式的计算精度和适用范围又难以确定。

Then, it is pointed out that grey interval incidence coefficient formula is an improvement of classic grey incidence coefficient formula, while the method for grey interval clustering decision is generalization of method for classical grey clustering decision.

灰色区间关联系数公式是经典灰色关联系数公式的推广，而灰色区间聚类决策是经典灰色聚类决策方法的拓展。

In this paper a second order step size iteration formula is derived in detail and the recursive expression for the expanded N-order step size iteration formula is deduced.

文中详细推导了2阶步长迭代公式，并导出了扩展的N阶步长迭代公式的递归表达式。

Both MAX(1) and MARG(1) are subclasses of the minimal unsatisfiable formulas, and formulas in these subclasses can be represented by trees.

MAX(1)和MARG(1)是极小不可满足公式的两个子类，这两个子类中的公式可以用树表示。

Based on the parabola and catenary theories, calculation formulas on the cable length are summarized, and the precision is discussed.

以抛物线和悬链线理论为基础，总结推导了悬索索长的实用计算公式，对各公式的计算精度进行了分析。

Both the methods for measuring such optical constants as cleavage angle, interference color level, extinction angle, length sign, optical sign, optic angle, pleochroism formula, absorptivity formula and the determining program for transparent minerals will be emphasized to lecture.

重点讲授透明矿物解理夹角、消光角、延性符号、干涉色级序、光性符号、光轴角、多色性公式、吸收性公式的测定方法和透明矿物的鉴定程序。

Using the divisible theory of the integer,the underside conclusion is proved:for all the vertex-coloring formulas of the regular polyhedron ,let be any integer,the result of these formulas is still the integer.

利用整数的整除理论，证明了以下结论：在所有正多面体顶点着色公式中，当颜色数取任何一个整数时，这些公式的计算结果仍然是整数。

An experimental gear equation of yam winding on usual spinning frame is given out in this paper.

给出了常用细纱机型卷绕成形齿轮的经验计算公式，并以FA506型细纱机为例，对经验公式的推导过程进行了介绍，为棉纺厂工程技术人员进行细纱工艺设计提供了参考依据。

An easy experienced equation to calculate the displacement of the sectional warper spacing reed in yarn sectional warping is introduced in this paper,and practical applications of this equation are also detailed,which could be taking as references for technicians in textile mill.

介绍了分条整经工序中整经机定幅筘位移量的简易经验计算公式，具体例举了公式的实际应用情况，可供纺织企业技术人员参考。

To use the standard deviation formula, the students just can do it in detail digit. They are weakly to the alphabet handling and certificating.

大多数学生对于标准差公式的运用停留在公式运算水平，对于字母的处理和证明能力比较弱。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。