Agricultural labor force aging; Land resources use efficiency; Inverted "u" type curve.
农业劳动力老龄化；土地资源利用效率；倒“U”型关系。
On the base of these notions, the second mean valued theorems for the second type curve integral are proved.
本文探讨了对称性在第二类曲线积分和第二类曲面积分中的应用，给出了一些有用的结论，并举例说明。
Besides, an automated type curve matching technique other than manual method is applied here to explain the underground hydraulic fracture parameters conveniently.
改变了过去的手动曲线拟合为自动拟合，便于解释地下水力裂缝参数。
Results showed that the growth and development of White-Cheeked Starling's nestlings was divided into three period, the nestlings growth presented the "s" type curve.
结果表明：灰椋鸟雏鸟生长发育分为三个时期，雏鸟生长呈现“S”型曲线。
Type curve match analysis is the main method of modern well test interpretation, but the error of this method is unavoidable because of the limitation of the type curves in a sample plot.
图版拟合是现代试井分析的主要方法，由于图版上典型曲线分辨率的限制，使得典型曲线图版拟合分析不可避免地存在误差。
We gamed solutions to theoretical formulas under different boundary conditions, presented the method to determine the gas reservoir factor and single well controllable range by means of type curve.
求解了不同边界条件下的理论公式；给出了利用试井理论曲线确定气层参数和单井控制范围的方法。
We gained solutions to theoretical formulas under different boundary conditions, presented the method to determine the gas reservoir factor and single well controllable range by means of type curve.
求解了不同边界条件下的理论公式；给出了利用试井理论曲线确定气层参数和单井控制范围的方法。
Examples of superposition analysis method for changing production rate test are given in the paper. The results are compared with the results getting from Horner method and type curve matching method.
文中给出了变产量叠加方法应用的示例，并与霍纳方法及典型曲线拟合方法进行了对比分析。
This type-curve is obtained with both analytic method and difference method giving the same results.
这种图版是应用两种完全不同的方法——解析方法和数值方法求得的，其结果是一致的。
This type-curve is obtained with both analytic method and difference method giving the same results.
这种图版是应用两种完全不同的方法——解析方法和数值方法求得的，其结果是一致的。
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