电力系统发生非全相运行时，系统中(    )负序电流。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id < 4421552 and id<>'4421552' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id > 4421552 and id<>'4421552' order by id asc limit 5