单相桥式或全波整流电路，电容滤波后，负载电阻札上的电压平均值等于（)0

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='30217' and id < 2444268 and id<>'2444268' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30217' and id > 2444268 and id<>'2444268' order by id asc limit 5