高频保护使用的频率越高其通道衰耗越小。（   ）

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69014' and id < 4466944 and id<>'4466944' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69014' and id > 4466944 and id<>'4466944' order by id asc limit 5