根据设备的绝缘水平和造价,以下几个电压等级中,允许操作过电压倍数最高的是()。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69489' and id < 4501303 and id<>'4501303' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69489' and id > 4501303 and id<>'4501303' order by id asc limit 5