So Current measurement is the basic of Electromagnetic surveying.

所以电流的测量是电磁测量的基础。

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Surveying the internal resistance of a sensitive electric current meter is a rather difficult and complicated electromagnetic experiment which is hard to get a high precision.

灵敏检流计内阻测量实验是电磁学实验中一个比较复杂有相当难度的实验，难就难在如何提高测量精度。

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With the development of electromagnetic applications in modern science and technology, electromagnetic wave surveying underground targets become an important area of application.

随着电磁波应用在现代科技中的飞速发展，电磁探测地下目标成为电磁波应用的一个重要领域。

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