题目内容
直流试验电压的脉动是指对电压()的周期性波动。
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='32665' and id < 2597930 and id<>'2597930' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32665' and id > 2597930 and id<>'2597930' order by id asc limit 5