Cloge detection system of pigging and extrusion tools is adopting very - low - frequency radiowave emission and reception.

清管及挤涂工具的阻卡探测系统是采用甚低频无线电波发射、接收.

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This paper analyses the electromagnetic radiation with very low frequency caused power - supply wiring of household appliances.

本文讨论了家用电器馈(电)线所产生的“特低频电磁辐射”问题.

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This paper briefly discusses very low frequency ( VLF ) electromagnetic technique and takes Shancheng gold mine for example.

简要叙述了 甚低频 电磁法的方法技术,并以山城金矿为例.

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