两个耦合线圈和为反向串联，，，，则串联后的等效电感为（　　）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68473' and id < 4420983 and id<>'4420983' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68473' and id > 4420983 and id<>'4420983' order by id asc limit 5