Detector installed in the crane boom end, at the top of the metal ball as a detecting probe, can detect electric field around the wire.
检测器安装在起重机臂端，其上端的金属球作为检测探头，可以检测电线周围的电场。
Detector installed in the crane boom end, at the top of the metal ball as a detecting probe, can detect electric field around the wire.
检测器安装在起重机臂端，其上端的金属球作为检测探头，可以检测电线周围的电场。
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