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。
应用推荐