时域中电流的瞬时值为负值，说明该时刻它的实际方向与参考方向相反。（）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32632' and id < 2594862 and id<>'2594862' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32632' and id > 2594862 and id<>'2594862' order by id asc limit 5