额定频率为50Hz的变压器,施加相当于2倍试品额定电压的试验电压来进行感应耐压试验时,试验电源的频率不得低于( )。
发布时间:2026-04-19
A.75Hz
B.100Hz
C.150Hz
D.200Hz
试卷相关题目
-
SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69522' and id < 4504110 and id<>'4504110' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69522' and id > 4504110 and id<>'4504110' order by id asc limit 5
湘公网安备:43011102000856号 
