题目内容
斩控型交流调压电路提高斩波频率的不良影响为()
2020-12-16
A.增加了开关损耗
B.最低次谐波次数降低
C.总谐波畸变率增大
D.增大了输入滤波器体积
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='32652' and id < 2596131 and id<>'2596131' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32652' and id > 2596131 and id<>'2596131' order by id asc limit 5