下图所示电路中，已知则叫发出的平均功率为（）W。 

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='32635' and id < 2595035 and id<>'2595035' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32635' and id > 2595035 and id<>'2595035' order by id asc limit 5