.对于500 kV 线路，一般悬挂瓷绝缘子的片数为(   )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69520' and id < 4503879 and id<>'4503879' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69520' and id > 4503879 and id<>'4503879' order by id asc limit 5