装机容量在300万kW以下的，供电频率允许偏差为(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69460' and id < 4498503 and id<>'4498503' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69460' and id > 4498503 and id<>'4498503' order by id asc limit 5