直升机频率域电磁系统在磁性地区的视电阻率填图，长期存在争议。
The apparent resistivity mapping of the helicopter frequency domain em system in magnetic area has been a problem of long controversy.
直升机频率域电磁系统的最大勘探深度究竟是多少，一直是有争议的问题。
The maximum prospecting depth of the helicopter frequency domain EM system has been a problem of long controversy.
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