二级负荷可以采用单电源双回路供电。(    )  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69463' and id < 4498521 and id<>'4498521' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69463' and id > 4498521 and id<>'4498521' order by id asc limit 5