The restrain method of DFT frequency spectrum leakage base on signal symmetry extension is proposed in this paper, experimental results show that this method is effective.

提出一种利用信号对称拓展技术抑制离散傅立叶变换频谱泄漏的方法，实验证明是一种有效的方法。

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This article analyses the construct of HTML document and the type of noises, provides the news information exacting and noises restrain method, and the process of realization.

文章在分析了网页的HTML文档结构和噪音类型的基础上，给出了网页文本信息提取、对噪声抑制的方法，以及实现的过程。

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Then in the electromagnetic compatible aspect, it also analyses the electromagnetic characteristic and transmit route in GIS and puts forward the restrain method in hardware and software.

在电磁兼容方面，对GIS工作环境下的电磁干扰特点和传播途径进行分析，在硬件和软件方面采取抑制电磁干扰的措施。

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