题目内容
已知某非正弦电压u(t)=[2+4cos(wt+30°)+3cos(3wt+10°]V,那么此非正弦电压的有效值为()。
2021-01-08
A.5.19V
B.5.38V
C.7.35V
D.9V
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='32677' and id < 2599480 and id<>'2599480' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32677' and id > 2599480 and id<>'2599480' order by id asc limit 5