These conclusions would be the effective supplement to currentsurveying criterion, and helpful for building ballastless track.
以上结论是对现行测量规范的有效补充，对我国无砟轨道建设具有参考价值。
2
So Current measurement is the basic of Electromagnetic surveying.
所以电流的测量是电磁测量的基础。
3
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.