In this paper double series of functions with posititve coefficients are discussed and a natural condition of the convergence is obtained with the aid of matrix methods.
本文利用矩阵方法对二重函数项级数进行讨论，得到了极其自然的收敛条件。
The system could carry on the single-series refrigeration cycle, double-series refrigeration cycle and cascade refrigeration cycle through the designed regulating station.
通过设计的调节站，该装置可以进行单级制冷循环、双级制冷循环以及复叠式制冷循环。
The system could carry on the single-series refrigeration cycle, double-series refrigeration cycle and cascade refrigeration cycle through the designed regulating station.
通过设计的调节站，该装置可以进行单级制冷循环、双级制冷循环以及复叠式制冷循环。
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