use-cost difference

By the use of tensor calculus, basic aerothermodynamic equations in conservative form and characteristic theory in non-orthogonal curvilinear coordinates are derived. The boundary conditions in solving these problems are then discussed in detail. An improved version of MacCormack difference scheme is used in the numerical solution.

本文使用张量工具，导出非正交曲线坐标下弱守恒型基本方程组与特征理论，较全面地讨论了这类问题的边界条件；

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The paper use the method of Chi-Square test to check the difference the data of different dimensions of two countries. The researcher examined the correlation of the relevant dimensions.

论文通过对两国数据的比较进行卡方检验，查看双方不同维度是否有显著差异。

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In Shandong province, by the use of sowing in different of stages different region, the difference of light and temperature factor under natural conditions were formed. Systematically analysis effects of coefficient of light and temperature factor on yield and its components in maize were also presented.

在山东省境内采用不同区域分期播种，形成自然条件下光温值的差异，系统分析光、温因子与玉米产量的关系。

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The use of a difference measuring method for the system can reduce the influence of quantization error of A/ D converter, thereby increasing the measurement accuracy of the temperature rise rate and enhancing the accuracy of thermal stress calculation.

该系统中采用了一种测差法，该方法减小了测量中模数转换器的量化误差的影响，提高了温升率测量的准确度和热应力计算的准确度。

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The basic slope failure pattern of tension fissure-circular surface slip-plane failure is obtained for study of slope failure of flat rock strata by use of double bottom friction model by which the difference in strength of various rocks can be reflected.

采用双层底面摩擦模型，研究近水平岩层边坡破坏模式，能体现出不同岩体在强度上的差异，得到近水平岩层边坡破坏为张裂缝圆弧面平面的边坡滑动破坏的基本模式。

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