我国规定，凡是（   ）均属于大接地电流系统。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69376' and id < 4491182 and id<>'4491182' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69376' and id > 4491182 and id<>'4491182' order by id asc limit 5