[本科]结合滤波器和耦合电容器组成的带通滤波器对50Hz工频应呈现极大的衰耗，以阻止工频串入高频装置。（  ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69487' and id < 4500976 and id<>'4500976' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69487' and id > 4500976 and id<>'4500976' order by id asc limit 5