The signal average method was used in order to increase the S/N ratio, and the optimum sweep time and average times were experimentally determined.
为了提高信噪比，采用了信号平均技术，并通过实验确定了最佳采样时间和平均次数。
N fertilization in both plantations significant decreased the biomass of the first five order roots by the method of soil cores in four sampling seasons and two soil depths.
施杀虫剂处理导致两林分四个季节、两个土层中细根生物量显著增加，但是，两树种仅前两级根的生物量显著增加。
N this paper, four factors method for calculating the first-order linear circuit is proposed. Concerned with the forced response in this method, two kinds of new calculating methods are presented.
本文提出了计算一阶线性电路的四要素法，对该法中的强制响应提出了两个新的计算方法；
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