Factors affecting constant pressure difference control method and advantages and disadvantages of the control plan are analyzed theoretically through pipe system head curve and pump performance curve.

根据管道水力特性曲线与水泵的性能曲线，运用理论分析的方法，对影响末端定压差控制方式的因素和该控制方案的利弊进行了分析。

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This paper gives a method to obtain solution of linear homogeneous difference systems with constant coefficients. The method of this paper is illustrated by a example.

给出了求常系数线性齐次差分方程组通解的一种方法，用一个例子说明所给方法。

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The big difference between measured and theoretic manifold of the circular array showed that the broadband constant beamwidth beamforming method used in the paper has good tolerance.

实验圆阵的实测阵列流形和理论阵列流形存在较大误差，这表明该文采用的可适用于任意结构阵列的宽带恒定束宽波束形成方法具有良好的宽容性。

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The indicators of the production of GDP are re-valued at constant prices with the double deflation method where the value added at constant prices is the difference between the value of output and the value of intermediate consumption at constant prices.

UNESCO: Belarus: Report: Part I: Descriptive Section