一级负荷应有两个电源供电：当一个电源发生故障时，另一个电源不应同时受到损坏。(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69461' and id < 4498397 and id<>'4498397' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69461' and id > 4498397 and id<>'4498397' order by id asc limit 5