Transient electromagnetic methods is one of thebest means to find water currently.
瞬变电磁法是目前寻找水源的最好方法之一。
For city active fault detection, urban noise is a key problem in the use of electrical or electromagnetic methods.
城市噪音主要指由于城市设施和人类活动（如电网、管线、通讯设备、建筑物、交通等）对电磁信号的干扰。
At present, the far-zone apparent resistivity definition is usually used in the frequency domain electromagnetic methods.
目前在频率域电磁法中常常采用远区视电阻率定义。
It's indispensable to use the long wire source to overcome the interference of the natural source in most of the electromagnetic methods of exploration geophysics.
在大多数勘查地球物理电磁法的应用中，利用长导线源克服天然场干扰问题是非常必要的。
We can find out that from 2 meters to 20 meters is a difficulty for the several mainly electromagnetic methods, but this domain is closed related with human's activity.
由此可见，地下2～20米范围对于以上几种方法来说都是一个困难，而这一范围却与人类活动极为密切。
We can find out that from 2 meters to 20 meters is a difficulty for the several mainly electromagnetic methods, but this domain is closed related with human's activity.
由此可见，地下2～20米范围对于以上几种方法来说都是一个困难，而这一范围却与人类活动极为密切。
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