题目内容
测量非正弦周期信号的有效值可以选用（ ）仪表。
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69319' and id < 4487805 and id<>'4487805' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69319' and id > 4487805 and id<>'4487805' order by id asc limit 5