自耦变压器一次侧的输入功率等于全部二次侧的输出功率，这个功率极限称为自耦变压器的（  ）。 

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69485' and id < 4500665 and id<>'4500665' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69485' and id > 4500665 and id<>'4500665' order by id asc limit 5