变压器负载运行时，若负载为纯电阻性，其电压调整率 ΔU% 通常为（  ）（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id < 4494902 and id<>'4494902' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69421' and id > 4494902 and id<>'4494902' order by id asc limit 5