变压器的空载运行是指变压器一次绕组加交流绕组，二次绕组（   ）的运行情况。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69469' and id < 4498930 and id<>'4498930' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69469' and id > 4498930 and id<>'4498930' order by id asc limit 5