理想变压器端口上的电压.电流参考方向如下图所示，则其伏安特性为（）。 

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32634' and id < 2594975 and id<>'2594975' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32634' and id > 2594975 and id<>'2594975' order by id asc limit 5