SF6气体绝缘强度高，主要原因是（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68449' and id < 4418968 and id<>'4418968' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68449' and id > 4418968 and id<>'4418968' order by id asc limit 5