母线差动保护按母差保护差动回路中的阻抗分类，可分为(   )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69493' and id < 4501566 and id<>'4501566' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69493' and id > 4501566 and id<>'4501566' order by id asc limit 5