以下为句子列表：
英文: Based on an analysis of the formation mechanism of induced current in underground pipelines, the author holds that, where underground media show very poor conductance, underground pipelines are dominated by magnetic dipole lines, and where underground med
中文: 摘要通过对地下管线中的感应电流形成机理分析，本文认为，当地下介质导电性很差时，地下管线以磁偶极线为主；而当地下介质存在一定的导电性时，管线则等效于电流线。
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