架空线路的电杆按材质分为（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27216' and id < 2260398 and id<>'2260398' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27216' and id > 2260398 and id<>'2260398' order by id asc limit 5