当变压器带纯阻性负载时，其外特性曲线是（ ）的

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68476' and id < 4421228 and id<>'4421228' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68476' and id > 4421228 and id<>'4421228' order by id asc limit 5