变压器的过励磁保护是按磁密度B正比于( )原理实现的。
发布时间:2026-01-24
A.电压U与频率f的乘积
B.电压U与频率f的比值
C.电压U与绕组匝数N的比值
D.电压U与绕组匝数N的乘积
试卷相关题目
-
SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69479' and id < 4501047 and id<>'4501047' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69479' and id > 4501047 and id<>'4501047' order by id asc limit 5
湘公网安备:43011102000856号 
