[本科]闭锁式方向纵联保护中采用负序功率方向继电器具有以下优点：（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69487' and id < 4500924 and id<>'4500924' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69487' and id > 4500924 and id<>'4500924' order by id asc limit 5