[本科]高频保护采用相-地耦合制高频通道是因为（  ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69478' and id < 4500865 and id<>'4500865' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69478' and id > 4500865 and id<>'4500865' order by id asc limit 5