带电更换绝缘子或在绝缘子串上作业,应保证作业中良好绝缘子片数不少于:220kV（    ）片。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='66200' and id < 4296517 and id<>'4296517' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='66200' and id > 4296517 and id<>'4296517' order by id asc limit 5