当系统的有功功率和无功功率都不足，因而频率和电压都偏低时，应该首先解决(    )的问题。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69456' and id < 4498162 and id<>'4498162' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69456' and id > 4498162 and id<>'4498162' order by id asc limit 5