某变压器套管表面积污后遇雾天，发生沿表面的放电，该放电类型为（ ）。（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69414' and id < 4494273 and id<>'4494273' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69414' and id > 4494273 and id<>'4494273' order by id asc limit 5