我国电力系统对频率偏移的具体规定是任何电力系统.任何情况下频率偏移都不得超过±0.2Hz。(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69461' and id < 4498372 and id<>'4498372' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69461' and id > 4498372 and id<>'4498372' order by id asc limit 5