对于变压器，当U1=U1N和I2=I2N时，U2=U2N。（   ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69442' and id < 4497141 and id<>'4497141' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69442' and id > 4497141 and id<>'4497141' order by id asc limit 5